docs: reference alpha

README.md

@@ -12,7 +12,7 @@
   Configurable persistence and rehydration of Pinia stores.
 </p>
 <p align="center">
-  <a href="https://npmjs.com/package/pinia-plugin-persistedstate"><img src="https://img.shields.io/npm/v/pinia-plugin-persistedstate?style=flat-square&labelColor=313244&color=cba6f7" alt="npm"></a>
+  <a href="https://npmjs.com/package/pinia-plugin-persistedstate"><img src="https://img.shields.io/npm/v/pinia-plugin-persistedstate/alpha?style=flat-square&labelColor=313244&color=cba6f7" alt="npm"></a>
   <a href="https://bundlephobia.com/result?p=pinia-plugin-persistedstate"><img src="https://img.shields.io/bundlephobia/minzip/pinia-plugin-persistedstate?style=flat-square&labelColor=313244&color=cba6f7" alt="minizipped size"></a>
   <a href="https://github.com/prazdevs/pinia-plugin-persistedstate/blob/main/LICENSE"><img src="https://img.shields.io/github/license/prazdevs/pinia-plugin-persistedstate?style=flat-square&labelColor=313244&color=cba6f7" alt="license"></a>
 </p>