Style/MixinUsage in default rails app

[printercu]

Moved from rubocop/rubocop#5237

Every fresh rails app has bin/{setup,update} with toplevel include FileUtils.

This cop does not provide autofix, and to fix this warning it requires remastering this files, which results in conflicts when updating rails.

Should this files be added to default exclude list for this cop?

[tjustino]

With the last releases, this issue doesn't appear anymore (tested this morning with an update to rails 6.0.0.beta2 and rubocop 0.65.0).
It seems this issue can be closed.

[andyw8]

For reference, here's where it was changed: rails/rails#34084

[andyw8]

I'd say this is still an issue since many people will be using Rails 5 or older.

[koic]

I think this issue has been resolved by #168.