appraise "4.0" do
  gem "rails", "~> 4.0.0"
end
appraise "4.1" do
  gem "rails", "~> 4.1.0"
end
appraise "4.2" do
  gem "rails", "~> 4.2.0"
end
appraise "5.0" do
  gem "rails", "~> 5.0.0"
end