.travis.yml in paperclip-deflater-0.1.4 vs .travis.yml in paperclip-deflater-0.1.5

@@ -1,10 +1,11 @@
 language: ruby
 
 rvm:
   - 2.1
-  - 2.2
-  - 2.3
+  - 2.2.6
+  - 2.3.3
+  - 2.4.0
 
 install:
   - "gem install bundler"
   - "bundle install --jobs=3 --retry=3"