[gimp-web] Mention GTK4

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit 64c10e003a128c10fb9f3d26e86b5bb242d7530a
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Thu Dec 17 01:10:14 2020 +0300

    Mention GTK4

 content/news/2020/2020-12_GIMP-2.99.4_Released/index.md | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/content/news/2020/2020-12_GIMP-2.99.4_Released/index.md 
b/content/news/2020/2020-12_GIMP-2.99.4_Released/index.md
index f6c25574..55349f0d 100644
--- a/content/news/2020/2020-12_GIMP-2.99.4_Released/index.md
+++ b/content/news/2020/2020-12_GIMP-2.99.4_Released/index.md
@@ -61,6 +61,9 @@ FIXME
 
 FIXME
 
+We are aware that GTK 4.0 is out, we have no plans switching over
+to it before GIMP 3.0 is released.
+
 You can [donate to the project and personally fund several GIMP
 developers](https://www.gimp.org/donating/) who make this all possible
 at all. This is also a way to give back and accelerate the development