update ruby version in travis config

manuelmeurer · manuelmeurer · commit dff9d90f573b · 2017-03-31T14:22:40.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,9 +1,9 @@
 language: ruby
 sudo: false
 rvm:
-  - 2.2.6
-  - 2.3.3
-  - 2.4.0
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
 before_install:
   - gem update --system
   - gem update bundler
