language: ruby
before_install: gem install bundler && bundler -v
install: bundle install --jobs=3 --retry=3
before_script: bundle install
script: bundle exec rake
rvm:
  - 2.2.8
  - 2.3.5
  - 2.4.2
  - ruby-head
matrix:
  allow_failures:
    - rvm: ruby-head