[meld/meld-3-20] Update README for discourse move

[Kai Willadsen <kaiw src gnome org>]

commit 01fae445261519c3ba10375a5e07161b2c908d60
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Oct 18 10:41:43 2020 +1000

    Update README for discourse move

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index fe9e5848..0f6f5da5 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ and new contributors are always welcome!
 
 List of issues: https://gitlab.gnome.org/GNOME/meld/issues
 
-Mailing list:   https://mail.gnome.org/mailman/listinfo/meld-list
+Support forum:  https://discourse.gnome.org/tag/meld