[exim] Exim 4.89 release process starts Jan 30

Folks,

I'm going to pick up the Release Engineer hat for the next Exim release.
The last few releases have been fairly big and ambitious and a few of us
think that a stabilization release is called for.

Jeremy and Heiko have a fix for the DKIM/chunking issues in soak-testing
now, it'll go in soon.

I expect to start the RC process on Monday 30th January.

This will be a strict RC series with no new features after RC1 is cut
unless critical to fixing known bugs. New features might still go in
before then, but please don't rush things in!

I'll probably branch git for 4.89 and let folks continue to commit to
master and merge in anything relevant for the release.

I'll look at Bugzilla a fair bit next week to try to triage issues; for
anything that's a feature, it will be punted to 4.90 at the earliest.
If you are tracking dev and know what's in git master already, and think
that there's an open issue which hasn't been fixed but should be before
the next release, then please reply off-list to me with ticket numbers
and explanation.

Thanks,
-Phil