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

language: ruby
script: "bundle exec rspec"
bundler_args: "--without extras"
env:
  - CI=true
rvm:
  - 2.5
  - 2.6

Drop Ruby 2.4 testing, add 2.6
Drop Ruby 2.4 testing, add 2.6
