.travis.yml in infoblox-0.5.3 vs .travis.yml in infoblox-1.0.0

@@ -1,6 +1,7 @@
 language: ruby
 rvm:
+  - 2.3.1
   - 2.2.4
   - 2.1.6
   - 1.9.3
   - jruby-19mode
   - jruby-head