.travis.yml in carrierwave-base64-1.7 vs .travis.yml in carrierwave-base64-1.8

@@ -2,9 +2,10 @@
 
 rvm:
  - 1.9.3
  - 2.0.0
  - 2.1.5
+ - 2.2.2
  - ruby-head
 
 gemfile:
   - Gemfile