[gimp] NEWS: start the GIMP 2.99.8 section.

[Jehan <jehanp src gnome org>]

commit 8c2afcb31b9d3721f35ef51fa760ce6dee639b94
Author: Jehan <jehan girinstud io>
Date:   Sat May 8 13:28:56 2021 +0200

    NEWS: start the GIMP 2.99.8 section.

 NEWS | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
---
diff --git a/NEWS b/NEWS
index 9b298ef07f..5d11448b99 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,26 @@
 This is the unstable branch of GIMP.
 
 
+Overview of Changes from GIMP 2.99.6 to GIMP 2.99.8
+===================================================
+
+API:
+
+  - New gimp_display_present() function to present a specific display at
+    the top of the image display stack.
+
+Translations:
+
+  - New Vietnamese translation for the installer.
+
+Build:
+
+  - New CI job for a Windows native build with MSYS2.
+  - Several less critical CI jobs moved to a scheduled run for resource
+    saving.
+  - Improved tag handling in the CI for transparent release process.
+
+
 Overview of Changes from GIMP 2.99.4 to GIMP 2.99.6
 ===================================================
 
@@ -165,6 +185,11 @@ Translations:
 
   - New Hebrew translation for the installer.
 
+Build:
+
+  - Bumping minimum GEGL to version 0.4.30.
+
+
 Overview of Changes from GIMP 2.99.2 to GIMP 2.99.4
 ===================================================