Bump ruby version

jberkel · jberkel · commit fd9b42e5d865 · 2017-09-29T07:21:54.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: objective-c
-rvm: 2.2
+rvm: 2.3
 osx_image: xcode9
 env:
   global:
