Notice of data breach at Teachable (formerly Fedora)

I just received this email (to an address I'd used to sign up to a course on https://bitfountain.teachable.com/):

Dear <chaghalibaghali>,

We are writing to inform you of a suspected data breach involving accounts created between September 17, 2013 and November 21, 2015. We have reason to suspect that personal information related to accounts on Bitfountain (joined 2014-08-19) may have been compromised. This includes the email addresses and passwords associated with the school's Teachable (formerly Fedora) account.

As a precaution we are enforcing password resets for potentially affected users.

You can reset your password here: https://sso.teachable.com/secure/teachable_accounts/password/new

If you happen to use this password with any other service, we highly recommend updating your password there as well.

We apologize for the inconvenience, and thank you for your understanding in helping us keep Teachable safe.

Team Teachable