FVWM: Fvwm3-RC0 is released

Hi all,

I've just released RC0 of Fvwm3.  Doubtless there are a few bugs still to fix
(hence the first RC), and I'm going to be remain cautious on this one as it's
the first step towards an actual 1.0.0 release of Fvwm3.

Please do give this a try.  See:

    https://github.com/fvwmorg/fvwm3/releases/tag/1.0.0-rc0

Please heed the release instructions.  Any questions/comments, please ask
here, or even better, on Github's issue tracker.

Enjoy!

Cheers,
Thomas