config/default.yml does not match Rubocop of the same version #179

It looks like this file: https://github.com/airbnb/ruby/blob/master/rubocop-airbnb/config/default.yml must be updated. It has not been updated for 3 years even though rubocop dependency has been updated for many times since then.

This gem is dependent on 'rubocop', '~> 0.80.0', but config/default.yml in this repo is not the same as default.yml in rubocop 0.80.0. This is an issue because this file lists all cops and supported styles for them. So if one wants to use a style that was added in 0.80.0, they cannot because of the outdated default.yml. Therefore, the possibilities of configuration are greatly restricted.

Is there a reason why this file is so old?