language: ruby
script: "bundle exec rspec"
bundler_args: "--without extras"
env:
  - CI=true
rvm:
  - '2.1.9'
  - 2.2
  - 2.3
  - 2.4

language: ruby
script: "bundle exec rspec"
bundler_args: "--without extras"
env:
  - CI=true
rvm:
  - 2.4
  - 2.5

Stop testing on Ruby < 2.4, add 2.5
Stop testing on Ruby < 2.4, add 2.5
