Update .travis.yml

.travis.yml

@@ -1,26 +1,29 @@
 language: php
 
-sudo: false
-dist: trusty
-
-php:
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - 7.1
-  - 7.2
-  - 7.3
-  - 7.4snapshot
-
 matrix:
+  fast_finish: true
   include:
     - dist: precise
       php: 5.3
+      env: deps=low
     - dist: precise
       php: 5.3
-      env: deps=low
-  fast_finish: true
+    - php: 5.4
+      dist: trusty
+    - php: 5.5
+      dist: trusty
+    - php: 5.6
+      dist: xenial
+    - php: 7.0
+      dist: xenial
+    - php: 7.1
+      dist: bionic
+    - php: 7.2
+      dist: bionic
+    - php: 7.3
+      dist: bionic
+    - php: 7.4
+      dist: bionic
 
 before_script:
   - if [[ $TRAVIS_PHP_VERSION = 5.* ]]; then echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi