language: ruby
sudo: false
env:
  - RAILS_VERSION="~> 4.1.16"
  - RAILS_VERSION="~> 4.2.10"
  - RAILS_VERSION="~> 5.0.7"
  - RAILS_VERSION="~> 5.1.6"
  - RAILS_VERSION="~> 5.2.0"
rvm:
  - 2.5.1
  - 2.4.4
  - 2.3.7
  - 2.2.10
  - 2.1.10
matrix:
  exclude:
  - rvm: 2.1.10
    env: RAILS_VERSION="~> 5.0.7"
  - rvm: 2.1.10
    env: RAILS_VERSION="~> 5.1.6"
  - rvm: 2.1.10
    env: RAILS_VERSION="~> 5.2.0"
  - rvm: 2.4.4
    env: RAILS_VERSION="~> 4.1.16"
  - rvm: 2.5.1
    env: RAILS_VERSION="~> 4.1.16"
before_install:
  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
  - gem install bundler -v '< 2'