update readme

Author: DavidBadura

README.md

@@ -1,13 +1,18 @@
-[![Latest Stable Version](https://poser.pugx.org/patchlevel/event-sourcing-psalm-plugin/v)](//packagist.org/packages/patchlevel/event-sourcing-psalm-plugin)
 [![License](https://poser.pugx.org/patchlevel/event-sourcing-psalm-plugin/license)](//packagist.org/packages/patchlevel/event-sourcing-psalm-plugin)
 
-# event-sourcing-psalm-plugin
+# event-sourcing-phpstan-extension
 
-psalm plugin for [event-sourcing](https://github.com/patchlevel/event-sourcing) library.
+phpstan extension for [event-sourcing](https://github.com/patchlevel/event-sourcing) library.
 
 ## installation
 
 ```
-composer require --dev patchlevel/event-sourcing-psalm-plugin
-vendor/bin/psalm-plugin enable Patchlevel\\EventSourcingPsalmPlugin\\Plugin
+composer require --dev patchlevel/event-sourcing-phpstan-extension
 ```
+
+add the extension to your `phpstan.neon`:
+
+```neon
+includes:
+	- vendor/patchlevel/event-sourcing-phpstan-extension/extension.neon
+```