allow failure when using hhvm

Author: Gravitano

.travis.yml

@@ -6,6 +6,10 @@ php:
   - 5.6
   - hhvm
 
+matrix:
+    allow_failures:
+        - php: hhvm
+
 before_script:
   - composer self-update
   - composer install --prefer-source --no-interaction --dev