.travis.yml in zip-container-2.0.0 vs .travis.yml in zip-container-2.1.0

@@ -1,11 +1,17 @@
 language: ruby
+
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.1.2
+  - 2.1.5
   - ruby-head
   - rbx-2
+
+sudo: false
+
+cache: bundler
+
 matrix:
   allow_failures:
     - rvm: ruby-head
     - rvm: rbx-2