Update .travis.yml

.travis.yml

@@ -1,13 +1,5 @@
 language: php
 sudo: false
-php:
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-  - 7.1
-  - hhvm
 branches:
   except:
     - v0.5
@@ -22,3 +14,12 @@ script:
   - vendor/bin/phpunit -c phpunit.xml.travisci
 matrix:
   fast_finish: true
+  include:
+    - php: 5.3
+    - php: 5.4
+    - php: 5.5
+    - php: 5.6
+    - php: 7.0
+    - php: 7.1
+    - php: hhvm
+      dist: trusty