Added ruby head to travis.

ryanfox1985 · ryanfox1985 · commit b2c44e9ee059 · 2016-01-18T09:51:28.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,5 +6,9 @@ rvm:
   - 2.1
   - 2.2
   - 2.3.0
+  - ruby-head
+matrix:
+  allow_failures:
+    - rvm: ruby-head
 before_install:
   - rvm @global do gem install bundler
