Gearing up for the 2.2 release

[Mikhail Glushenkov]

Hi *,

It is time to start planning for the 2.2 release of
Cabal/cabal-install. The original plan was to do it before the end of
the year, however, given the current state of HEAD and the fact that
GHC 8.4 is going to be released in February, I think it won't be a
tragedy if we delay 2.2 a little. My current plan is to cut the 2.2
branch around January 15th, and make the release 2-3 weeks after that.
So please hurry if there's something you absolutely want to get into
2.2.

Current release blockers/stuff that I really want to see included:

* Herbert's work on the forwards-compat scheme
(https://github.com/haskell/cabal/issues/4899)
* Duncan's target package names stuff
(https://github.com/haskell/cabal/pull/4889)
* Oleg's remaining parser PRs and SPDX work.
* Some other currently unmerged PRs that are not marked blocked or are
easy to get into mergeable shape.


Cheers,
Mikhail