appraise "activerecord-4.2" do
  gem "activerecord", "~> 4.2.0"
end

appraise "activerecord-5.0" do
  gem "activerecord", "~> 5.0.0"
end

appraise "activerecord-5.1" do
  gem "activerecord", "~> 5.1.0"
end