Slim-Lint 0.20.0

This is a hotfix to address breaking changes in the upstream RuboCop gem.

• Update minimum RuboCop version to 0.78.0 due to renaming of various cops and namespaces

Slim-Lint 0.19.0

• Remove dependency on sysexits gem
• Update RuboCop dependency to require 0.77.0 or newer

Slim-Lint 0.18.0

• Remove explicit dependency on Rake, making it optional as it's only needed for the Rake integration

Slim-Lint 0.17.1

• Fix CommentControlStatement to not report rubocop:{enable,disable} directives

Slim-Lint 0.17.0

• Disable Layout/AlignArguments and Layout/InitialIndentation cops by default
• Update EmptyLineAfterGuardClause cop namespace from Style to Layout to fix errors
• Drop support for Ruby 2.3 and older