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

When using #delegate, ActiveSupport creates a new method on the class, but this method does not respect the visibility scope of said class.

For example:

class Foo
  def initialize(bar)
    @bar = bar
  end

  attr_reader :bar

  private

  delegate :baz, to: :bar
end

The generated method #baz will not be private. The #delegate method does, however, provide an option to create a private method like so:

delegate :baz, to: :bar, private: true

Describe the solution you'd like

I would like a cop that detects calls to #delegate that:

1. Are in a private scope.
2. Does not pass the private: true option.