Update rvm version to travis.yml

ogom · ogom · commit 750dfc8553eb · 2017-06-29T09:56:00.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,8 @@
 language: ruby
 rvm:
-  - 2.1
-  - 2.2
-  - 2.3.0
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
   - ruby-head
 script:
   - bundle exec rspec
