Test on ruby 2.4.0-preview1

tanaka51 · tanaka51 · commit 5d603ef56520 · 2016-09-14T03:33:16.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,3 +4,4 @@ rvm:
   - 2.1
   - 2.2
   - 2.3.0
+  - 2.4.0-preview1

-Original file line number
+Diff line change
   - 2.1
   - 2.2
   - 2.3.0
 +  - 2.4.0-preview1