Update .travis.yml

Author: cebe

.travis.yml

@@ -11,8 +11,8 @@ php:
 # http://docs.travis-ci.com/user/build-configuration/#Rows-That-are-Allowed-To-Fail
 matrix:
   fast_finish: true
-  allow_failures:
-    - php: hhvm-nightly
+#  allow_failures:
+#    - php: hhvm-nightly
 
 install:
   - composer self-update && composer --version