Bumped minimum required development PHP version to 7.4

.travis.yml

@@ -3,7 +3,6 @@ dist: bionic
 language: php
 
 php:
-  - 7.3
   - 7.4
   - nightly
 
@@ -18,7 +17,7 @@ cache:
     - app/vendor
 
 install:
-  - composer install
+  - composer install --no-suggest
   - npm ci
 
 script:

composer.json

@@ -30,6 +30,7 @@
         "vlucas/phpdotenv": "^4.0"
     },
     "require-dev": {
+        "php": ">=7.4",
         "friendsofphp/php-cs-fixer": "^2.3",
         "johnkary/phpunit-speedtrap": "^3.2",
         "phpunit/phpunit": "^9.1",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "448fcacef3506c13036baca5eeb02f29",
+    "content-hash": "97cdefd2e4480748bbb183e286dc6640",
     "packages": [
         {
             "name": "erusev/parsedown",
@@ -5636,6 +5636,8 @@
         "ext-fileinfo": "*",
         "ext-zip": "*"
     },
-    "platform-dev": [],
+    "platform-dev": {
+        "php": ">=7.4"
+    },
     "plugin-api-version": "1.1.0"
 }