Add PHP 7.0/7.1 to travis tests

Author: Crizz0

.travis.yml

@@ -1,12 +1,8 @@
 language: php
 php:
-  - 5.3.3
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - 7.1
-  - hhvm
 
 install:
   - php composer.phar install --dev --no-interaction --prefer-source