.travis.yml in fluent-plugin-webhdfs-0.4.1 vs .travis.yml in fluent-plugin-webhdfs-0.4.2

@@ -1,12 +1,15 @@
 language: ruby
 
 rvm:
-  - 1.9.3
   - 2.0.0
-  - 2.1.1
+  - 2.1
+  - 2.2
 
 branches:
   only:
     - master
+
+before_install:
+  - gem update bundler
 
 script: bundle exec rake test