appraise 'rails-4-0' do
gem 'rails', '~>4.0.0'
end
appraise 'rails-4-1' do
gem 'rails', '~>4.1.0'
end
appraise 'rails-4-2' do
gem 'rails', '~>4.2.0'
end
appraise 'rails-5-0' do
gem 'rails', '~>5.0.0'
end
appraise 'rails-5-1' do
gem 'rails', '~>5.1.0'
end