[amtk] NEWS file: not forgetting the date, for next version

[Sébastien Wilmet <swilmet src gnome org>]

commit beda30abde195359ecc7760ca80dbf26ad4a8d7e
Author: Sébastien Wilmet <swilmet informatique-libre be>
Date:   Sun Apr 17 16:59:55 2022 +0200

    NEWS file: not forgetting the date, for next version

 NEWS | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 77deff0..acf3d44 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,5 @@
-News in 5.x.y (not yet released)
--------------
+News in 5.x.y, 2022-xx-yy (not yet released)
+-------------------------
 * Some files reorganization within the git repository.
 * Update the README.md file, etc.
 * Some code refactorings, it's now easier to copy part of the code (e.g., just