.travis.yml in zip-container-1.1.0 vs .travis.yml in zip-container-2.0.0

@@ -1,5 +1,11 @@
 language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.2
+  - ruby-head
+  - rbx-2
+matrix:
+  allow_failures:
+    - rvm: ruby-head
+    - rvm: rbx-2