.travis.yml in dnc-0.1.5 vs .travis.yml in dnc-0.1.6

@@ -1,11 +1,11 @@
 language: ruby
 cache: bundler
 
 rvm:
   - ruby-head
-  - 2.1.2
-  - 2.1.1
+  - 2.2.3
+  - 2.1.6
   - 2.0.0
   - 1.9.3
 
 script: 'bundle exec rake'