Rails/HttpStatus cop fails because Rack is missing

[andyw8]

If the rack gem isn't present, the engine emits errors such as:

An error occurred while Rails/HttpStatus cop was inspecting /code/app/controllers/errors_controller.rb:6:4.

See https://github.com/rubocop-hq/rubocop/issues/5745

A PR was opened rubocop/rubocop#5707 but didn't get merged.

[koic]

I think that this issue is solved in RuboCop Rails gem.

• Add rack to runtime dependency rubocop/rubocop-rails#36
• Relax rack dependency for Rails 4 rubocop/rubocop-rails#68

Please use RuboCop Rails gem when using Rails cops because these cops has been removed from RuboCop 0.72.