language: ruby
script: bundle exec appraisal rspec
rvm:
  - 2.0.0
  - 2.2.2
  - 2.3.1
before_install:
  - gem install bundler
before_script:
  - bundle exec appraisal install

language: ruby
script: bundle exec appraisal rspec
rvm:
  - 2.0.0
  - 2.2.2
  - 2.3.3
  - 2.4.0
before_install:
  - gem install bundler
before_script:
  - bundle exec appraisal install

Use MRI 2.3.3, add 2.4.0 for Travis CI.
Use MRI 2.3.3, add 2.4.0 for Travis CI.
