.travis.yml in graphql-batch-0.1.0 vs .travis.yml in graphql-batch-0.2.0

@@ -1,4 +1,5 @@
 language: ruby
 rvm:
-  - 2.1.5
-before_install: gem install bundler -v 1.10.6
+  - 2.1
+  - 2.2
+before_install: gem install bundler -v 1.11.2