.travis.yml in mui-sass-0.9.12 vs .travis.yml in mui-sass-0.9.13

@@ -1,10 +1,10 @@
 language: ruby
 
 rvm:
-  - 2.2.6
-  - 2.3.3
-  - 2.4.0
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
 
 before_install: gem install bundler
 
 sudo: false