language: ruby
branches:
  only:
    - master
rvm:
  - 2.1.9
  - 2.2.5
  - 2.3.1
  - 2.4.0-preview1
env:
  - "RAILS_VERSION=4.1.0"
  - "RAILS_VERSION=4.2.0"
  - "RAILS_VERSION=5.0.0"
matrix:
  exclude:
    - rvm: 2.1.9
      env: "RAILS_VERSION=5.0.0"
    - rvm: 2.4.0-preview1
      env: "RAILS_VERSION=4.1.0"
    - rvm: 2.4.0-preview1
      env: "RAILS_VERSION=4.2.0"
sudo: false