Allow failures on hhvm nightly

JeroenDeDauw · thiemowmde · commit 8da053931650 · 2015-03-13T17:14:02.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -8,6 +8,10 @@ php:
   - hhvm
   - hhvm-nightly
 
+matrix:
+  allow_failures:
+    - php: hhvm-nightly
+
 before_script: composer install --prefer-source
 
 sudo: false
