Add Ruby 2.2.4 to .travis.yml

yui-knk · yui-knk · commit aa421a59e266 · 2015-12-18T02:19:01.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,6 +9,7 @@ rvm:
   - 1.9.3
   - 2.0.0
   - 2.1
+  - 2.2.4
   - jruby-18mode
   - jruby-19mode
   - jruby-head
