.travis.yml in trello_flow-3.5.0 vs .travis.yml in trello_flow-3.6.0

@@ -1,4 +1,4 @@
 language: ruby
 rvm:
-  - 2.2.2
-before_install: gem install bundler -v 1.11.2
+  - 2.3.3
+before_install: gem install bundler