.travis.yml in warp-1.4.0 vs .travis.yml in warp-1.5.0

@@ -1,14 +1,15 @@
 language: ruby
 
+sudo: false
+cache: bundler
+
 env:
   global:
     - TRAVIS_CI=1
 
 rvm:
   - 1.9.3
-  - 2.0.0
-  - 2.1.5
   - 2.2.1
 
 gemfile:
   - gemfiles/rails_3.2_rspec_3.0.gemfile
   - gemfiles/rails_3.2_rspec_3.1.gemfile