.travis.yml in weighted_shuffle-0.1.0 vs .travis.yml in weighted_shuffle-0.2.0

@@ -1,14 +1,7 @@
 language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
-  - ruby-head
   - jruby-19mode
-  - jruby-head
-  - rbx-19mode
-  - rbx-head
+  - rbx-2.1.1
 script: bundle exec rspec
-matrix:
-  allow_failures:
-    - rvm: rbx-19mode
-    - rvm: rbx-head