[gimp] NEWS: kickstart 2.99.10 news section.

[Jehan <jehanp src gnome org>]

commit 34d34c2ffdc9ee16f82b7e52c1e6216396315378
Author: Jehan <jehan girinstud io>
Date:   Thu Nov 11 21:42:44 2021 +0100

    NEWS: kickstart 2.99.10 news section.

 NEWS | 13 +++++++++++++
 1 file changed, 13 insertions(+)
---
diff --git a/NEWS b/NEWS
index be706abd19..e299dd5acf 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,19 @@
 This is the unstable branch of GIMP.
 
 
+Overview of Changes from GIMP 2.99.6 to GIMP 2.99.10
+====================================================
+
+Plug-ins:
+
+  - PSD:
+    * new support for loading 16-bit per channel CMYK images.
+    * new support for files in LAB colorspace.
+  - AVIF:
+    * prefer AOM encoder for export (rather than "rav1e", default of
+      libheif, yet with worse performance).
+
+
 Overview of Changes from GIMP 2.99.6 to GIMP 2.99.8
 ===================================================