Update main README

Author: a16n-dev

README.md

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 [![Types](https://img.shields.io/npm/types/react-dialog-async.svg)](https://www.npmjs.com/package/react-dialog-async)
 [![Downloads](https://img.shields.io/npm/dt/react-dialog-async.svg)](https://www.npmjs.com/package/react-dialog-async)
 
+> V3 has been released! Check out the [blog post](https://react-dialog-async.a16n.dev/blog/2025-10-04-release-3-0-0/) and [migration guide](https://react-dialog-async.a16n.dev/guides/v3-migration/) for details
+
 React Dialog Async provides a hook-based API for managing dialog state in React apps, with a focus on performance and developer ergonomics.
 
 [✨ Read the docs here ✨](https://react-dialog-async.a16n.dev)