.travis.yml in omniauth-multi-provider-0.2.0 vs .travis.yml in omniauth-multi-provider-0.2.1

@@ -1,11 +1,9 @@
 language: ruby
 rvm:
-  - 2.4.0
-  - 2.3.3
+  - 2.4.2
+  - 2.3.5
 before_install:
-  # Workaround for https://github.com/sickill/rainbow/issues/48
-  - gem update --system
-  - gem install bundler -v 1.13.7
+  - gem install bundler -v 1.15.4
 script:
   - bundle exec rubocop
   - bundle exec rspec