This instance will be upgraded to Heptapod 0.23.2 on 2021-08-05 at 11:00 UTC+2 (a few minutes of down time)

readme: move the support channel on libera

This lingered a bit but the Freenode situation is becoming clownier and clownier
by the hour.

--HG--
branch : stable
8 jobs for topic/stable/foolish-fly in 4 minutes and 36 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #206623
checks-py2

00:01:14

passed #206624
checks-py3

00:01:22

passed #206629
doc

00:00:36

manual #206622
allowed to fail manual
pytype
passed #206625
tests-py2-cext

00:04:24

passed #206626
tests-py2-pure

00:04:09

passed #206627
tests-py3-cext

00:04:35

passed #206628
tests-py3-pure

00:02:41