Is your feature request related to a problem? Please describe.

Gemspec/RequiredRubyVersion enforces that gemspec.required_ruby_version is set and then complains that it differs from TargetRubyVersion in .rubocop.yml even if it is not specified in .rubocop.yml.

Having to specify TargetRubyVersion in .rubocop.yml in addition to gemspec.required_ruby_version duplicates the information.

I really like enforcing one expectation per example. But with RSpec's exception matching, you need two expect calls if you want to assert something about an exception:

expect { my_code }.to raise_error(MyErrorType) do |error|
  expect(error.message).to match /something went wrong/
end

There's no way to match against the error message without first wrapping the call, and RSpec o

Check out OrderFields PR as an example