.travis.yml in fluent-plugin-out-http-0.1.3 vs .travis.yml in fluent-plugin-out-http-0.1.4

@@ -1,11 +1,21 @@
 rvm:
- - 1.9.2
- - 1.9.3
- - 2.0.0
- - 2.1.0
+  - 1.9.3
+  - 2.0.0
+  - 2.1
+  - 2.2
+  - ruby-head
+  - rbx-2
 
+os:
+  - linux
+  - osx
+
 gemfile:
- - Gemfile
+  - Gemfile
 
 script: bundle exec rake test
 
+matrix:
+  allow_failures:
+    - rvm: ruby-head
+    - rvm: rbx-2