.travis.yml in connection_pool-2.2.0 vs .travis.yml in connection_pool-2.2.1

@@ -3,11 +3,11 @@
 cache: bundler
 language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.0
-  - 2.2.0
+  - 2.1.6
+  - 2.2.2
   - jruby
   - rbx-2
 notifications:
   email:
     - [e-mail]