Update Jakub Wilk's e-mail address in CONTRIBUTORS

[jwilk]

No description provided.

[squid-prbot]

Can one of the admins verify this patch?

[rousskov]

I sent a notification email to the old address, just to be on the safe side and avoid setting a bad precedent. I got an acceptable 550 unknown user (in reply to RCPT TO command) response.

[rousskov]

rebuild

[jwilk]

I sent a notification email to the old address, just to be on the safe side and avoid setting a bad precedent.

Thanks for being diligent. :)

I got an acceptable 550 unknown user (in reply to RCPT TO command) response.

Yeah, the old address no longer works.
It's still associated with my GitHub account, so you can verify it's really me by looking at some old commits of mine, e.g. jwilk/sinntp@e72e059.