.travis.yml in conoha-0.3.0 vs .travis.yml in conoha-0.3.1

@@ -1,6 +1,7 @@
 language: ruby
 rvm:
   - 2.0.0
   - 2.1.7
   - 2.2.3
-before_install: gem install bundler -v 1.10.6
+  - 2.3.0
+before_install: gem install bundler -v 1.11.2