.travis.yml in arel-6.0.0.beta1 vs .travis.yml in arel-6.0.0.beta2

@@ -1,13 +1,15 @@
+language: ruby
 script: 
   - "rake test"
   - "gem build arel.gemspec"
 rvm:
   - rbx
   - jruby
   - 1.9.3
   - 2.0.0
-  - 2.1.1
+  - 2.1
+  - ruby-head
 matrix:
   allow_failures:
     - rvm: rbx
 notifications:
   email: false