use latest ruby version in CI

takkanm · takkanm · commit 656c8135f86e · 2017-04-02T23:01:51.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,8 +9,8 @@ rvm:
   - 2.0.0
   - 2.1.10
   - 2.2.6
-  - 2.3.3
-  - 2.4.0
+  - 2.3.4
+  - 2.4.1
   - ruby-head
 matrix:
   allow_failures:
