Update README.md

Author: CodeWithDennis

README.md

@@ -4,6 +4,8 @@
 [![GitHub Code Style Action Status](https://img.shields.io/github/actions/workflow/status/codewithdennis/filament-simple-alert/pint.yml?branch=main&label=code%20style&style=flat-square)](https://github.com/codewithdennis/filament-simple-alert/actions?query=workflow%3A"Fix+PHP+code+styling"+branch%3Amain)
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+To use this package with a Filament `4.x` project, check out the [guide here](https://github.com/CodeWithDennis/filament-simple-alert/tree/4.x).
+
 This package offers a straightforward and easy-to-use alert component for your Filament application. It allows you to quickly implement customizable alert messages, enhancing the user experience by
 providing clear and concise notifications.