gnucash maint: Add a tip about announcements and other mailing lists

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash/commit/5cabbbc9 (commit)
	from  https://github.com/Gnucash/gnucash/commit/790eb3b4 (commit)



commit 5cabbbc99855a2928c6396455e892b0857b36f59
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Tue Apr 28 00:58:57 2020 +0200

    Add a tip about announcements and other mailing lists



Summary of changes:
 doc/tip_of_the_day.list.c | 5 +++++
 1 file changed, 5 insertions(+)