fixes travis build.

Florian Lautenschlager · Florian Lautenschlager · commit 6d53239ef2b5 · 2016-10-20T14:32:39.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-- 2.1
+- 2.2
 
 before_script:
  - chmod +x ./script/cibuild # or do this locally and commit
