Update README.md

Author: D1M1TR10S

README.md

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 # Function Calling Extensions Sample
 
 > [!NOTE]
-> Copilot Extensions are in public beta and may be subject to change
-> All users with a GitHub Copilot Individual subscription or higher can use Copilot Extensions
+> Copilot Extensions are in public beta and may be subject to change.
 
 ## Description
 This project is a Go application that demonstrates how to use function calling in a GitHub Copilot Extension.