Keep Travis CI from installing development dependencies.

Malte Rohde · Malte Rohde · commit 320318954a43 · 2016-04-26T15:14:24.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,6 +3,7 @@ sudo: false
 language: ruby
 
 cache: bundler
+bundler_args: --without development
 
 rvm:
   - ruby-head
