.travis.yml in simple_oauth-0.1.6 vs .travis.yml in simple_oauth-0.1.7

@@ -1,9 +1,10 @@
 language: ruby
 rvm:
   - 1.8.7
   - 1.9.2
   - 1.9.3
+  - ruby-head
   - jruby-18mode
   - jruby-19mode
   - rbx-18mode
   - rbx-19mode