docs: 📝 update README.md

Author: luthfimasruri

README.md

@@ -9,7 +9,7 @@
 </h3>
 <p align="center">
   <a href="https://www.npmjs.com/package/@vueup/vue-quill" title="Version">
-    <img alt="npm (tag)" src="https://img.shields.io/npm/v/@vueup/vue-quill/alpha">
+    <img alt="npm (tag)" src="https://img.shields.io/npm/v/@vueup/vue-quill/beta">
   </a>
   <a href="https://www.npmjs.com/package/@vueup/vue-quill" title="License">
     <img src="https://img.shields.io/npm/l/@vueup/vue-quill" alt="License">