[Dune] Dune 2.2 release schedule

[Oliver Sander]

Dear Dune,

we are getting closer to the final release.  There are still a few patches
in my pipeline to be applied to the release branch, and I will do a beta2
release tonight.  Then, if all goes well, I will create the official
Dune 2.2.0 release on sunday 6th in the evening.  Or, if real life(TM)
interferes, monday 7th in the morning.  Thanks to all who have been
helping to test and fixing bugs,

Oliver