.travis.yml in squib-0.0.6 vs .travis.yml in squib-0.1.0

@@ -1,6 +1,6 @@
 language: ruby
+cache: bundler
 rvm:
   - 2.0.0
-  - 2.1.2
-before_install: gem install bundler --version '~> 1.6' 
-
+  - 2.1.5
+  - 2.2.0