.travis.yml in rubysl-date-2.0.8 vs .travis.yml in rubysl-date-2.0.9

@@ -1,7 +1,9 @@
 language: ruby
 env:
   - RUBYLIB=lib:.
 script: mspec spec
 rvm:
-  - 2.1.0
+  - ruby-head
+  - 2.2.0
+  - 2.1.5
   - rbx-2