Include rubocop-faker autocorrect in deprecation

[koic]

Follow up #1714.

This is a proposal to make it easy to convert positional arguments to keyword arguments.

This approach is based on the experience that factory_bot has provided for upgrades.

• thoughtbot/factory_bot@dabacda
• Print warning about static attribute deprecation thoughtbot/factory_bot#1135

First, I prepared rubocop-faker gem for upgrading with auto-correction.
https://github.com/koic/rubocop-faker

This PR includes rubocop-faker autocorrect in deprecation.
The following is an example.

% cat example.rb
require 'faker'

Faker::Lorem.words(10000, true)

Before

% bundle exec ruby example.rb
example.rb:3: Passing `number` with the 1st argument of `Lorem.words` is
deprecated. Use keyword argument like `Lorem.words(number: ...)`
instead.
example.rb:3: Passing `supplemental` with the 2nd argument of
`Lorem.words` is deprecated. Use keyword argument like
`Lorem.words(supplemental: ...)` instead.

After

% bundle exec ruby example.rb
example.rb:3: Passing `number` with the 1st argument of `words` is
deprecated. Use keyword argument like `words(number: ...)` instead.
example.rb:3: Passing `supplemental` with the 2nd argument of `words` is
deprecated. Use keyword argument like `words(supplemental: ...)`
instead.

To automatically update from positional arguments to keyword arguments,
install rubocop-faker and run:

rubocop \
  --require rubocop-faker \
  --only Faker/DeprecatedArguments \
  --auto-correct

Basically, users can update by copying and pasting the command displayed in the warning, so the upgrade is easy.

I'm not sure if a dependency on 3rd party gem will be accepted.
Can you please kindly consider it?