language: ruby
rvm:
  - 2.3
  - 2.4
  - 2.5
  - 2.6
before_install:
  - gem update --remote bundler
  - gem update --system

language: ruby
rvm:
  - 2.3
  - 2.4
  - 2.5
  - 2.6
  - 2.7
before_install:
  - gem update --remote bundler
  - gem update --system

Add Ruby 2.7 to build matrix
Add Ruby 2.7 to build matrix

Ruby 2.7 got released some time ago. More and more distributions ship it
so I think we should also run the tests on it.
