.travis.yml in mercenary-0.3.4 vs .travis.yml in mercenary-0.3.5

@@ -1,9 +1,12 @@
 language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.0
+  - 2.1
+sudo: false
+cache: bundler
+before_script: bundle update
 script: "./script/cibuild"
 notifications:
   email:
     recipients:
       - [e-mail]