crates.io phishing: be alert, but not alarmed

Some lovely people have decided to send out some e-mails today to try to get people to sign into GitHub as part of "confirming your e-mail address on crates.ws". (Note the different domain.)

Please don't click on those links. I don't think good things will happen to your GitHub account if you do.

(If you did click on one of those links, please contact us at help@crates.io. No shame! We just want to make sure you're good.)