.travis.yml in amq-protocol-2.1.0 vs .travis.yml in amq-protocol-2.2.0

@@ -1,13 +1,14 @@
 language: ruby
 bundler_args: --without development
 cache: bundler
 script: "bundle exec rspec spec"
 rvm:
-  - 2.3.0
-  - 2.2
-  - 2.1
-  - 2.0
+  - "2.4.0"
+  - "2.3.3"
+  - "2.2"
+  - "2.1"
+  - "2.0"
   - ruby-head
 notifications:
   recipients:
     - [e-mail]
 matrix: