.travis.yml in fluent-plugin-hipchat-0.1.7 vs .travis.yml in fluent-plugin-hipchat-0.2.0

@@ -1,7 +1,8 @@
 rvm:
- - 1.9.3
- - 2.0.0
  - 2.1
  - 2.2
-
-script: bundle exec rake test
+ - 2.3.3
+before_install:
+ - gem update bundler
+script:
+ - bundle exec rake test