.travis.yml in maid-0.5.0 vs .travis.yml in maid-0.6.0.alpha.1

@@ -1,6 +1,11 @@
 language: ruby
 cache: bundler
+os:
+  - linux
+  - osx
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.0-preview2
+  - 2.1.0
+  - 2.1.1
+  - 2.1.2