.travis.yml in test-kitchen-1.11.1 vs .travis.yml in test-kitchen-1.12.0

@@ -1,10 +1,11 @@
 language: ruby
 
 rvm:
-  - 2.2.4
-  - 2.1.8
+  - 2.1.9
+  - 2.2.5
+  - 2.3.1
   - ruby-head
 
 env:
   - global:
     - machine_user=travis
@@ -30,10 +31,10 @@
   only:
   - master
 
 matrix:
   include:
-    - rvm: 2.2.4
+    - rvm: 2.2.5
       # To run the proxy tests we need additional gems than what Test Kitchen normally uses
       # for testing
       gemfile: Gemfile.proxy_tests
       before_install:
         - sudo usermod -p `openssl passwd -1 'travis'` travis