To use ruby-head for Ruby 2.5.0dev.

hsbt · hsbt · commit cb02f07c09bf · 2017-04-24T15:33:42.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.5.0
-before_install: gem install bundler -v 1.14.6
+  - ruby-head
+before_install: gem install bundler
