[MlMt] MailMate release notes

[John Cooper]

Eric Sharakan wrote (at 5:53 AM on Wednesday, Dec 8, 2021):

> the primary purpose of release notes is to tell me what changed since the last version I downloaded. And ideally, this is true both for folks who download test versions as well as those who do not.

You're absolutely right. And saying so does not denigrate the other work that's been accomplished in any way.