[NetworkManager-openvpn] release: update NEWS file

[Lubomir Rintel <lkundrak src gnome org>]

commit b8ab2725f6fb6698f8641c91273f710776573347
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Wed Aug 24 10:08:02 2022 +0200

    release: update NEWS file

 NEWS | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/NEWS b/NEWS
index d97e421..533883e 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,17 @@
+=======================================================
+NetworkManager-openvpn-1.8.20
+Overview of changes since NetworkManager-openvpn-1.8.18
+=======================================================
+
+This is a new stable release of NetworkManager-openvpn.  Notable changes include:
+
+* Fix a regression in preserving the "tls-auth" settings.
+* Add support for "tls-min" and "tls-cipher" parameters.
+* Include the new gnome-control-center name in the AppData file.
+* Drop libnm-glib support, nobody is likely using it anymore.
+* Fix importing profiles with a PKCS#12 CA.
+* Make sure the plugin object links with glib.
+
 =======================================================
 NetworkManager-openvpn-1.8.18
 Overview of changes since NetworkManager-openvpn-1.8.16