language: ruby
rvm:
 - "2.2.3"
 - "2.1.7"
 - "2.0"

language: ruby
rvm:
 - "2.3.1"
 - "2.2.5"

Update rubies to test under Travis
Update rubies to test under Travis

Remove old rubies (incompatible with Rails 5) and add 2.3.
