appraise 'rails-5.0' do
  gem 'activerecord', '5.0.6'
  gem 'activesupport', '5.0.6'
  gem 'activemodel', '5.0.6'
end

appraise 'rails-5.1' do
  gem 'activerecord', '5.1.4'
  gem 'activesupport', '5.1.4'
  gem 'activemodel', '5.1.4'
end