bundler_args: --without development
language: ruby
sudo: false
rvm:
  - 2.1.9
  - 2.2.5
  - 2.3.1
script: bundle exec rspec spec

bundler_args: --without development
language: ruby
sudo: false
rvm:
  - 2.1.9
  - 2.2.5
  - 2.3.4
  - 2.4.1
script: bundle exec spec

Update CI to tests on ruby 2.4.1
Update CI to tests on ruby 2.4.1
