Update PHP versions

Author: jmontoyaa

.travis.yml

@@ -2,8 +2,9 @@ language: php
 php:
   - 5.5
   - 5.6
-  - 7
-  - hhvm
+  - 7.0
+  - 7.1
+  - 7.2
 before_script:
     - composer install --dev --no-interaction
 script: vendor/bin/phpunit