Generate .rubocop_todo.yml without any exclude limit

[andyw8]

(Apologies if this has been discussed previously, it's hard to search for with such a large issue volume.)

Is your feature request related to a problem? Please describe.

When setting up RuboCop on a project with a lot of existing offences, running --auto-gen-config results in many cops being entirely disabled (because there are more than the default limit of 15 occurrences).

To avoid that, I typically pass --exclude-limit with an arbitrary high limit such as 999999.

Describe the solution you'd like

I'd like to have a cleaner way to specify that no limit should supply, e.g:

• --exclude-limit=0 (treat 0 as a special indicator)
• --exclude-limit=-1 (treat any negative number as a special indicator)
• --no-exclude-limit

Describe alternatives you've considered

n/a

Additional context

n/a

[jonas054]

I would rule out --exclude-limit=0 beacuse it breaks compatibility. It can currently be used with the opposite purpose; to generate a todo file with no Exclude parameters.

Of the remaining two I like --no-exclude-limit the best, as I think using -1 is not entirely logical.

[andyw8]

Thanks for implementing this @r7kamura!