specify a ruby version

jarrodu · jarrodu · commit 02c2e3c14fd9 · 2016-10-22T17:37:07.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,8 @@
 sudo: false
 
 language: ruby
+rvm:
+  - 2.2
 
 # for faster builds
 cache: bundler
