Draft of Git Rev News edition 20

Hi,

A draft of a new Git Rev News edition is available here:

  https://github.com/git/git.github.io/blob/master/rev_news/drafts/edition-20.md

Everyone is welcome to contribute in any section either by editing the
above page on GitHub and sending a pull request, or by commenting on
this GitHub issue:

  https://github.com/git/git.github.io/issues/186

You can also reply to this email.

I tried to cc everyone who appears in this edition but maybe I missed
some people, sorry about that.

Thomas and myself plan to publish this edition on Wednesday
October 19.

Thanks,
Christian.