[libnma] release: update NEWS

[Lubomir Rintel <lkundrak src gnome org>]

commit 1a2664126bbde81a430c5b1364f52f578eddfec6
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Wed Jun 15 15:22:57 2022 +0200

    release: update NEWS

 NEWS | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/NEWS b/NEWS
index 1b919b96..501a16ff 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,12 @@
+=======================================
+libnma-1.8.40
+Overview of changes since libnma-1.8.38
+=======================================
+
+* Ad-Hoc networks now default to using WPA2 instead of WEP.
+* WEP is no longer provided as an option for connecting to hidden networks
+  due to its deprecated status.
+
 =======================================
 libnma-1.8.38
 Overview of changes since libnma-1.8.36