Update README.md

Author: Leopard20

README.md

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 The deluxe version of the older mod, All-In-One Command Menu, with updated visuals, new features and many bug fixes.
 
 [BI Forum Thread](https://forums.bohemia.net/forums/topic/224834-all-in-one-single-player-project/)
+# Note:
+The source code is out of date.
 
 # Installation:
 1. [Download the latest build](https://github.com/leopard20/All-In-One-Command-Menu/releases/latest) from the Releases tab.