#8 use ruby head 2.3.1 not supported by travis

Vincent Landgraf · Vincent Landgraf · commit b57723c3f269 · 2016-08-07T15:12:44.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,10 +4,10 @@ os:
   - osx
 rvm:
   - 2.2.5
-  - 2.3.1
+  - head
 env:
   - TRAVIS=true
 matrix:
   allow_failures:
-  - rvm: 2.3.1
+  - rvm: head
 
