Update Readme

Author: AndreiCristiDecuseara

src/argon-stubs/resources/views/users/index.blade.php

@@ -240,7 +240,7 @@
 </nav>    
             <div class="header bg-gradient-primary pb-8 pt-5 pt-md-8">
 <div class="container-fluid">
-    <div class="alert alert-warning" role="alert">
+    <div class="alert alert-danger" role="alert">
         <strong>This is a PRO feature!</strong>
       </div>
     <div class="header-body">