cache: bundler
language: ruby
sudo: false
rvm:
  - 2.5.0
  - 2.4.3
  - 2.3.6
  - 2.2.9
before_install: "gem update --system" # https://github.com/travis-ci/travis-ci/issues/8974

cache: bundler
language: ruby
sudo: false
rvm:
  - 2.5.1
  - 2.4.4
  - 2.3.7
before_install: "gem update --system" # https://github.com/travis-ci/travis-ci/issues/8974

Support of Ruby 2.2 has ended
Support of Ruby 2.2 has ended

https://www.ruby-lang.org/en/news/2018/06/20/support-of-ruby-2-2-has-ended/
