RFE: Say something nice when no errors exist

[cidrblock]

The lack of output for a successful run might leave someone wondering if anything was really checked.

Could something like this be added?

Congratulations! Finished with 0 failure(s), 0 warning(s) on 1254 files.

black does tell me I did a good job :)

All done! ✨ 🍰 ✨
112 files left unchanged.