diff --git a/.travis.yml b/.travis.yml
index f98ed8d..ae675bf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ language: php
 sudo: false
 
 php:
-  - 7.0
   - 7.1
   - 7.2
 
diff --git a/Behavioral/Strategy/Context.php b/Behavioral/Strategy/Context.php
index 6279f0e..6478492 100644
--- a/Behavioral/Strategy/Context.php
+++ b/Behavioral/Strategy/Context.php
@@ -20,4 +20,4 @@ class Context
 
         return $elements;
     }
-}
\ No newline at end of file
+}
diff --git a/composer.json b/composer.json
index bdf73ac..c9c8e6a 100644
--- a/composer.json
+++ b/composer.json
@@ -9,12 +9,12 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "php": ">=7.0",
+        "php": ">=7.1",
         "psr/http-message": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.0",
-        "squizlabs/php_codesniffer": "1.5.*"
+        "phpunit/phpunit": "^7",
+        "squizlabs/php_codesniffer": "^3"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
index 863381e..35105d1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "967b2d81af5c0ae65ab57db374efe747",
+    "content-hash": "af39391ec89831e5552cd0018816e53e",
     "packages": [
         {
             "name": "psr/http-message",
@@ -60,32 +60,32 @@
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.0.5",
+            "version": "1.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d"
+                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/8e884e78f9f0eb1329e445619e04456e64d8051d",
-                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
+                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3,<8.0-DEV"
+                "php": "^7.1"
             },
             "require-dev": {
                 "athletic/athletic": "~0.1.8",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpunit/phpunit": "~4.0",
-                "squizlabs/php_codesniffer": "~2.0"
+                "phpunit/phpunit": "^6.2.3",
+                "squizlabs/php_codesniffer": "^3.0.2"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "1.2.x-dev"
                 }
             },
             "autoload": {
@@ -110,41 +110,44 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2015-06-14T21:17:01+00:00"
+            "time": "2017-07-22T11:58:36+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.6.0",
+            "version": "1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "5a5a9fc8025a08d8919be87d6884d5a92520cefe"
+                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/5a5a9fc8025a08d8919be87d6884d5a92520cefe",
-                "reference": "5a5a9fc8025a08d8919be87d6884d5a92520cefe",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
+                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.4.0"
+                "php": "^5.6 || ^7.0"
             },
             "require-dev": {
-                "doctrine/collections": "1.*",
-                "phpunit/phpunit": "~4.1"
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^4.1"
             },
             "type": "library",
             "autoload": {
                 "psr-4": {
                     "DeepCopy\\": "src/DeepCopy/"
-                }
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "MIT"
             ],
             "description": "Create deep copies (clones) of your objects",
-            "homepage": "https://github.com/myclabs/DeepCopy",
             "keywords": [
                 "clone",
                 "copy",
@@ -152,20 +155,122 @@
                 "object",
                 "object graph"
             ],
-            "time": "2017-01-26T22:05:40+00:00"
+            "time": "2017-10-19T19:58:43+00:00"
         },
         {
-            "name": "phpdocumentor/reflection-common",
-            "version": "1.0",
+            "name": "phar-io/manifest",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c"
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
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             "dist": {
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-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "phar-io/version": "^1.0.1",
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "time": "2017-03-05T18:14:27+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/a70c0ced4be299a63d32fa96d9281d03e94041df",
+                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "time": "2017-03-05T17:38:23+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-common",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
                 "shasum": ""
             },
             "require": {
@@ -206,33 +311,39 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2015-12-27T11:43:31+00:00"
+            "time": "2017-09-11T18:02:19+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "3.1.1",
+            "version": "4.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "8331b5efe816ae05461b7ca1e721c01b46bafb3e"
+                "reference": "94fd0001232e47129dd3504189fa1c7225010d08"
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                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/8331b5efe816ae05461b7ca1e721c01b46bafb3e",
-                "reference": "8331b5efe816ae05461b7ca1e721c01b46bafb3e",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/94fd0001232e47129dd3504189fa1c7225010d08",
+                "reference": "94fd0001232e47129dd3504189fa1c7225010d08",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5",
-                "phpdocumentor/reflection-common": "^1.0@dev",
-                "phpdocumentor/type-resolver": "^0.2.0",
+                "php": "^7.0",
+                "phpdocumentor/reflection-common": "^1.0.0",
+                "phpdocumentor/type-resolver": "^0.4.0",
                 "webmozart/assert": "^1.0"
             },
             "require-dev": {
-                "mockery/mockery": "^0.9.4",
-                "phpunit/phpunit": "^4.4"
+                "doctrine/instantiator": "~1.0.5",
+                "mockery/mockery": "^1.0",
+                "phpunit/phpunit": "^6.4"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.x-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "phpDocumentor\\Reflection\\": [
@@ -251,24 +362,24 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2016-09-30T07:12:33+00:00"
+            "time": "2017-11-30T07:14:17+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "0.2.1",
+            "version": "0.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "e224fb2ea2fba6d3ad6fdaef91cd09a172155ccb"
+                "reference": "9c977708995954784726e25d0cd1dddf4e65b0f7"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/e224fb2ea2fba6d3ad6fdaef91cd09a172155ccb",
-                "reference": "e224fb2ea2fba6d3ad6fdaef91cd09a172155ccb",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/9c977708995954784726e25d0cd1dddf4e65b0f7",
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             "require": {
-                "php": ">=5.5",
+                "php": "^5.5 || ^7.0",
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             },
             "require-dev": {
@@ -298,37 +409,37 @@
                     "email": "me@mikevanriel.com"
                 }
             ],
-            "time": "2016-11-25T06:54:22+00:00"
+            "time": "2017-07-14T14:27:02+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.7.0",
+            "version": "1.7.5",
             "source": {
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                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
+                "reference": "dfd6be44111a7c41c2e884a336cc4f461b3b2401"
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-                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/dfd6be44111a7c41c2e884a336cc4f461b3b2401",
+                "reference": "dfd6be44111a7c41c2e884a336cc4f461b3b2401",
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             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0",
                 "sebastian/comparator": "^1.1|^2.0",
                 "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
             "require-dev": {
                 "phpspec/phpspec": "^2.5|^3.2",
-                "phpunit/phpunit": "^4.8 || ^5.6.5"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.6.x-dev"
+                    "dev-master": "1.7.x-dev"
                 }
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             "autoload": {
@@ -361,44 +472,44 @@
                 "spy",
                 "stub"
             ],
-            "time": "2017-03-02T20:05:34+00:00"
+            "time": "2018-02-19T10:16:54+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "5.0.3",
+            "version": "6.0.3",
             "source": {
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                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "4e99e1c4f9b05cbf4d6e84b100b3ff4107cf8cd1"
+                "reference": "774a82c0c5da4c1c7701790c262035d235ab7856"
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-                "reference": "4e99e1c4f9b05cbf4d6e84b100b3ff4107cf8cd1",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/774a82c0c5da4c1c7701790c262035d235ab7856",
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-                "php": "^7.0",
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-                "phpunit/php-text-template": "^1.2",
-                "phpunit/php-token-stream": "^1.4.11 || ^2.0",
-                "sebastian/code-unit-reverse-lookup": "^1.0",
-                "sebastian/environment": "^2.0",
-                "sebastian/version": "^2.0"
+                "php": "^7.1",
+                "phpunit/php-file-iterator": "^1.4.2",
+                "phpunit/php-text-template": "^1.2.1",
+                "phpunit/php-token-stream": "^3.0",
+                "sebastian/code-unit-reverse-lookup": "^1.0.1",
+                "sebastian/environment": "^3.1",
+                "sebastian/version": "^2.0.1",
+                "theseer/tokenizer": "^1.1"
             },
             "require-dev": {
-                "ext-xdebug": "^2.5",
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^7.0"
             },
             "suggest": {
-                "ext-xdebug": "^2.5.1"
+                "ext-xdebug": "^2.6.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "5.0.x-dev"
+                    "dev-master": "6.0-dev"
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@@ -413,7 +524,7 @@
             "authors": [
                 {
                     "name": "Sebastian Bergmann",
-                    "email": "sb@sebastian-bergmann.de",
+                    "email": "sebastian@phpunit.de",
                     "role": "lead"
                 }
             ],
@@ -424,20 +535,20 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2017-03-06T14:22:16+00:00"
+            "time": "2018-04-06T15:39:20+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
-            "version": "1.4.2",
+            "version": "1.4.5",
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                 "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
-                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5"
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-                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5",
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@@ -471,7 +582,7 @@
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-            "time": "2016-10-03T07:40:28+00:00"
+            "time": "2017-11-27T13:52:08+00:00"
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@@ -516,28 +627,28 @@
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-            "version": "1.0.9",
+            "version": "2.0.0",
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+                "php": "^7.1"
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+                "phpunit/phpunit": "^7.0"
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@@ -552,7 +663,7 @@
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                 {
                     "name": "Sebastian Bergmann",
-                    "email": "sb@sebastian-bergmann.de",
+                    "email": "sebastian@phpunit.de",
                     "role": "lead"
                 }
             ],
@@ -561,33 +672,33 @@
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                 "timer"
             ],
-            "time": "2017-02-26T11:10:40+00:00"
+            "time": "2018-02-01T13:07:23+00:00"
         },
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-                    "CodeSniffer/Standards/MySource/Sniffs/",
-                    "CodeSniffer/Standards/PEAR/Sniffs/",
-                    "CodeSniffer/Standards/PSR1/Sniffs/",
-                    "CodeSniffer/Standards/PSR2/Sniffs/",
-                    "CodeSniffer/Standards/Squiz/Sniffs/",
-                    "CodeSniffer/Standards/Zend/Sniffs/"
-                ]
-            },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "BSD-3-Clause"
@@ -1333,26 +1465,66 @@
                     "role": "lead"
                 }
             ],
-            "description": "PHP_CodeSniffer tokenises PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
+            "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
             "homepage": "http://www.squizlabs.com/php-codesniffer",
             "keywords": [
                 "phpcs",
                 "standards"
             ],
-            "time": "2014-12-04T22:32:15+00:00"
+            "time": "2018-02-20T21:35:23+00:00"
         },
         {
-            "name": "webmozart/assert",
-            "version": "1.2.0",
+            "name": "theseer/tokenizer",
+            "version": "1.1.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "time": "2017-04-07T12:08:54+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/0df1908962e7a3071564e857d86874dad1ef204a",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a",
                 "shasum": ""
             },
             "require": {
@@ -1389,7 +1561,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2016-11-23T20:04:58+00:00"
+            "time": "2018-01-29T19:49:41+00:00"
         }
     ],
     "aliases": [],
@@ -1398,7 +1570,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.0"
+        "php": ">=7.1"
     },
     "platform-dev": []
 }