Add command line argument to display which checks are enabled or disabled

A lot of linters for other languages have things like this. It helps diagnosing configuration issues.

Do you mean an additional option (~ --list-checks), which prints a list of enabled checks and a list of disabled checks, or an output in verbose mode?

Something like the --list-checks option was what I envisioned. I hadn't thought about the verbose mode angle on that. Maybe that would be helpful as well?