machine:
  ruby:
    version: 2.4.2
dependencies:
  override:
    - 'rvm-exec 2.2.2 bundle install'
    - 'rvm-exec 2.3.5 bundle install'
    - 'rvm-exec 2.4.2 bundle install'
    - 'rvm-exec 2.5.1 bundle install'
  post:
    - bundle exec bundle-audit update && bundle exec bundle-audit check
test:
  override:
    - 'rvm-exec 2.2.2 bundle exec rspec'
    - 'rvm-exec 2.3.5 bundle exec rspec'
    - 'rvm-exec 2.4.2 bundle exec rspec'
    - 'rvm-exec 2.5.1 bundle exec rspec'