update ruby of TravisCI

machu · machu · commit 2ff7aff25d08 · 2016-12-29T11:33:08.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,10 +2,9 @@ language: ruby
 cache: bundler
 
 rvm:
-  - 2.0.0
-  - 2.1
   - 2.2
-  - 2.3.0
+  - 2.3.3
+  - 2.4.0
   - ruby-head
 
 before_install:
