appraise 'rails40' do
  gem 'rails', '~> 4.0.0'
end

appraise 'rails41' do
  gem 'rails', '~> 4.1.0'
end

appraise 'rails42' do
  gem 'rails', '~> 4.2.0'
end

appraise 'rails50' do
  gem 'rails', '~> 5.0.0'
end