language: ruby
sudo: false
cache: bundle
rvm:
  # - 1.9.3
  - 2.0
  - 2.1
  - 2.2
  - 2.3.0
  - 2.4.0
  - 2.4.3
  - 2.5.0
script: rake test:coveralls
before_install: gem install bundler -v 1.10.6