Update README

Author: a16n-dev

packages/docs-v3/src/content/docs/blog/2025-10-04-release-3-0-0.mdx

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+---
+title: V3.0.0 has been released
+description: Release notes for version 3.0.0
+date: 2025-10-04
+---
+
+Version 3.0.0 for React Dialog Async has been released 🎉
+
+## What's new?
+* The listed react peer dependency version has been updated to include React 18 and 19
+
+---
+
+Feedback or ideas? We'd love to hear them! Open an issue over on [GitHub](https://github.com/a16n-dev/react-dialog-async/issues).

packages/react-dialog-async/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)