Rubocop is useful, but its defaults are more than a bit hostile. GoodCop exists to be a calmer, more reassuring sidekick.
Add goodcop to your Gemfile/gemspec/etc, and add the following to your .rubocop.yml:
inherit_gem: goodcop: .rubocop.yml
gem install goodcop
goodcop is released under the MIT License. See the bundled LICENSE file for details.