ci fix for php-cs-fixer hhvm

Author: tmilos

.travis.yml

@@ -20,7 +20,7 @@ install:
     - COMPOSER_ROOT_VERSION=dev-master composer update --prefer-source $COMPOSER_FLAGS
 
 script:
-    - php php-cs-fixer.phar fix --dry-run -v
+    - if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then php php-cs-fixer.phar fix --dry-run -v; fi
     - bin/phpunit --coverage-clover build/logs/clover.xml
 
 after_script: