Update README.md

Author: D1M1TR10S

README.md

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 This is an agent-based [GitHub Copilot Extension](https://docs.github.com/en/copilot/using-github-copilot/using-extensions-to-integrate-external-tools-with-copilot-chat) that provides a way to interact with [GitHub Models](https://github.blog/news-insights/product-news/introducing-github-models/), directly in Copilot Chat.
 
->[!NOTE]
-> Copilot Extensions are in public preview and GitHub Models are in limited public preview. They may be subject to change.
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 ## What it can do
 
 You can ask it things like "what models are available?" or "which model should I use for my use-case?". You can also ask it to execute a basic prompt using a particular model.