Puts back hhvm failure to travis config

sagikazarmark · sagikazarmark · commit 0c90a02434ca · 2015-06-08T12:48:50.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -10,6 +10,7 @@ php:
 matrix:
   allow_failures:
     - php: 7.0
+    - php: hhvm
   include:
     - php: 5.5
       env:
