add note about 1.21.9+

Author: ToCraft

README.md

@@ -1,3 +1,8 @@
+> [!IMPORTANT]  
+> Due to changes in Mojang's code, this mod **will not support Minecraft 1.21.9 or newer**. If you are a developer with skills in Minecraft modding, you are absolutely welcome to port this mod and create a PR.
+
+---
+
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