Merge pull request #19 from hruljov/v2

Update .travis.yml

Author: fdcore

.travis.yml

@@ -1,10 +1,13 @@
 language: php
 
 php:
-  - hhvm
-  - 5.6
-  - 5.5
   - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - 7.1
+  - hhvm # on Trusty only
+  - nightly
 before_script:
   - composer self-update
   - composer install