[amtk] NEWS file: write all the news so far for next version (5.3.2 or 5.4.0)

[Sébastien Wilmet <swilmet src gnome org>]

commit 995b925233cbc2905419454417cc24fbd4145060
Author: Sébastien Wilmet <swilmet informatique-libre be>
Date:   Fri Sep 24 02:07:45 2021 +0200

    NEWS file: write all the news so far for next version (5.3.2 or 5.4.0)

 NEWS | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/NEWS b/NEWS
index 1ef8269..1240cec 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+News in 5.x.y (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
+  one class) to another project.
+* Mark public API with G_MODULE_EXPORT, not the custom _AMTK_EXTERN macro.
+
 News in 5.3.1, 2021-01-11
 -------------------------
 * Build: port to Meson, remove Autotools.