gnucash maint: Release GnuCash 3.9

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/3c75140d (commit)
	from  https://github.com/Gnucash/gnucash/commit/058a5077 (commit)



commit 3c75140d04fd6bfab1a90b4268dfd6ce681d4f28
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Mar 28 11:35:34 2020 -0700

    Release GnuCash 3.9



Summary of changes:
 CMakeLists.txt |   2 +-
 NEWS           | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 167 insertions(+), 1 deletion(-)