(docs) add PWA support

Author: antoine92190

README.md

@@ -1,6 +1,5 @@
 <p align="center">
 <a href="https://travis-ci.org/antoine92190/vue-advanced-chat"><img src="https://img.shields.io/travis/antoine92190/vue-advanced-chat/master.svg"></a>
-<!-- <a href="https://codecov.io/github/antoine92190/vue-advanced-chat?branch=master"><img src="https://img.shields.io/codecov/c/github/antoine92190/vue-advanced-chat/master.svg"></a> -->
 <a href="https://www.npmjs.com/package/vue-advanced-chat"><img src="https://img.shields.io/npm/dm/vue-advanced-chat.svg"></a>
 <a href="https://www.npmjs.com/package/vue-advanced-chat"><img src="https://img.shields.io/bundlephobia/minzip/vue-advanced-chat"></a>
 <a href="https://www.npmjs.com/package/vue-advanced-chat"><img src="https://img.shields.io/npm/v/vue-advanced-chat.svg"></a>
@@ -24,6 +23,7 @@
 - Flexible options
 - Custom theming - light and dark modes
 - Firestore example
+- PWA support
 - Web Component support
 
 ## [Demo](https://antoine92190.github.io/vue-advanced-chat)