.travis.yml in uglifier-2.6.0 vs .travis.yml in uglifier-2.6.1

@@ -1,20 +1,23 @@
+sudo: false
 language: ruby
+cache: bundler
 rvm:
   - 1.8.7
   - 1.9.3
   - 2.0.0
   - 2.1.5
+  - 2.2.0
   - jruby
-  #- rbx-2 # Fails on Travis
+  - rbx-2
 git:
   submodules: false
 gemfile:
   - Gemfile
 matrix:
   include:
-    - rvm: 2.1.5
+    - rvm: 2.2.0
       gemfile: gemfiles/rubyracer
-    - rvm: 2.0.0
+    - rvm: 2.1.5
       gemfile: gemfiles/rubyracer
     - rvm: jruby-19mode
       gemfile: gemfiles/rubyrhino