language: ruby
sudo: false
env:
  - RAILS_VERSION="~> 4.1.16"
  - RAILS_VERSION="~> 4.2.10"
  - RAILS_VERSION="~> 5.0.6"
  - RAILS_VERSION="~> 5.1.4"
rvm:
  - 2.5.0
  - 2.4.3
  - 2.3.6
  - 2.2.9
  - 2.1.10
matrix:
  exclude:
  - rvm: 2.1.10
    env: RAILS_VERSION="~> 5.0.6"
  - rvm: 2.1.10
    env: RAILS_VERSION="~> 5.1.4"
  - rvm: 2.4.3
    env: RAILS_VERSION="~> 4.1.16"
  - rvm: 2.5.0
    env: RAILS_VERSION="~> 4.1.16"
before_install: gem install bundler -v 1.15.2