language: ruby
sudo: false
rvm:
  - 2.0
  - 2.1
  - 2.2
script: bundle exec rspec

language: ruby
sudo: false
rvm:
  - 2.0.0-p648
  - 2.1.10
  - 2.2.6
  - 2.3.1
  - 2.4.0
script: bundle exec rspec

Update CI to run against all current ruby versions.
Update CI to run against all current ruby versions.
