.travis.yml in zip-container-2.2.0 vs .travis.yml in zip-container-3.0.0

@@ -2,9 +2,10 @@
 
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.5
+  - 2.2.0
   - ruby-head
   - rbx-2
 
 sudo: false