Add recent versions to travis builds

dennisreimann · dennisreimann · commit 19326f639622 · 2015-03-05T13:42:19.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,4 +3,8 @@ script: rake
 rvm:
   - 1.9.3
   - 2.0.0
+  - 2.1.0
+  - 2.2.0
+  - ruby-head
+  - jruby-head
   - jruby-19mode
