.travis.yml in memoist-0.14.0 vs .travis.yml in memoist-0.15.0

@@ -1,12 +1,15 @@
+sudo: false
+cache: bundler
 language: ruby
 rvm:
   - 1.8.7
   - 1.9.2
   - 1.9.3
   - 2.0.0
   - 2.1.0
   - 2.2.0
+  - 2.3.0
   - jruby-18mode
   - jruby-19mode
   - rbx-2
   - ruby-head
   - jruby-head