Update CONTRIBUTING.md
authorMatthias Clasen <mclasen@redhat.com>
Wed, 6 May 2020 19:08:36 +0000 (15:08 -0400)
committerMatthias Clasen <mclasen@redhat.com>
Wed, 6 May 2020 19:08:36 +0000 (15:08 -0400)
commitb0fe4dec2cb7d022d0228955432b8ee7f7bdd880
tree34e4c5ae35dbbc9207e317e860317c2fc8970fe1
parentb86d81872c969cb140c36ad3e091095fa68a8380
Update CONTRIBUTING.md

Point to discourse, rather than mailing lists.
Based on a suggestion by sujiniku,

https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/1763
CONTRIBUTING.md