Merge pull request php-annotations#101 from php-annotations/php7-support

Adding PHP7 to the Travis CI configuration

Author: Alexander Obuhovich

.travis.yml

@@ -1,6 +1,6 @@
 language: php
 
-php: [5.3, 5.4, 5.5, 5.6, hhvm]
+php: [5.3, 5.4, 5.5, 5.6, hhvm, 7]
 
 before_script:
   - composer install --dev --prefer-source