efigence/cache_key_for

rails_versions = ['~> 4.1.0', '~> 4.2.0', '~> 5.0.0']

rails_versions.each do |rails_version|
  appraise "rails-#{rails_version.slice(/\d+\.\d+.\d+/)}" do
    gem 'rails', rails_version
  end
end