[NetworkManager-openvpn] release: update NEWS file

[Lubomir Rintel <lkundrak src gnome org>]

commit d7ff5e1eef68950a00934961f43f5c11ece4bada
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Fri Mar 11 17:22:37 2022 +0100

    release: update NEWS file

 NEWS | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/NEWS b/NEWS
index 4e4a473..d97e421 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,14 @@
+=======================================================
+NetworkManager-openvpn-1.8.18
+Overview of changes since NetworkManager-openvpn-1.8.16
+=======================================================
+
+This is a new stable release of NetworkManager-openvpn.  Notable changes include:
+
+* Gtk4 version of the editor plugin is now available (for use with Control
+  Center of GNOME 42 or later).
+* Update Catalan, Croatian, Czech, Hebrew and Slovenian translations.
+
 =======================================================
 NetworkManager-openvpn-1.8.16
 Overview of changes since NetworkManager-openvpn-1.8.14