Update README.md

Author: nicknisi

README.md

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 # AuthKit React Router Library
 
->[!NOTE]
+>[!IMPORTANT]
 > This is an early-stage port of [authkit-remix](https://github.com/workos/authkit-remix) to support React Router. The features focus on framework mode (e.g. Remix), with more planned support for library mode and more features.
 
 The AuthKit library for React Router 7+ provides convenient helpers for authentication and session management using WorkOS & AuthKit with React Router. You can find this library in action in the [react-rotuer-authkit-example](https://github.com/workos/react-rotuer-authkit-example) repo.