[Initiatives.wiki] Update Update App Screenshots

[Sophie Herold <sophieherold src gnome org>]

commit f7ca72751f0c2251a07fb682c5d9b84c0cc045f1
Author: Sophie Herold <sophie hemio de>
Date:   Sat Feb 19 01:12:09 2022 +0000

    Update Update App Screenshots

 Update-App-Screenshots.md | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/Update-App-Screenshots.md b/Update-App-Screenshots.md
index 0434f50..afa160e 100644
--- a/Update-App-Screenshots.md
+++ b/Update-App-Screenshots.md
@@ -14,6 +14,7 @@
 - Having `devel` CSS class applied to the ApplicationWindow
 - Adding text to the screenshot
 - Manually manipulating the screenshot
+- Duplicating the same screenshot for light/dark mode until [this is explicitly 
supported](https://github.com/ximion/appstream/issues/304)
 
 ## Help