Support author regex

[aaabramov]

If PR is merged on github website the author would be something like

123123123+original-username@users.noreply.github.com

I am not 100% when exactly this happens, but this prefix number is static per user (or by user+repo, I'll check it).

The idea is to support not only constant authors but also author email regex, e.g.:

\d+\+original-username@users\.noreply\.github\.com

I've already patched it in my mock repo, su if community will be interested in it, I'll open a PR.

[aaabramov]

Seems that this email is consistent through all repos.
So we can simply add 123123123+original-username@users.noreply.github.com to constant author list.

[aaabramov]

Okay, this thing really makes sense on github to keep author emails private.
https://docs.github.com/en/free-pro-team@latest/github/setting-up-and-managing-your-github-user-account/setting-your-commit-email-address