refactor(demo): checkout demo file from master

Author: LouisMazel

dist/demo.html

@@ -1,8 +1,10 @@
 <meta charset="utf-8">
 <title>vue-advanced-chat demo</title>
-<script src="https://unpkg.com/vue"></script>
-<script src="./vue-advanced-chat.js"></script>
+<script src="./vue-advanced-chat.umd.js"></script>
 
+<link rel="stylesheet" href="./vue-advanced-chat.css">
 
-<vue-advanced-chat></vue-advanced-chat>
 
+<script>
+console.log(vue-advanced-chat)
+</script>