Mention open source

index.html

@@ -74,7 +74,7 @@
                 <div class="row">
                     <div class="col-md-8 col-md-offset-2">
                         <h1 class="brand-heading">Converse.js</h1>
-                        <p class="intro-text">An XMPP chat client for your website</p>
+                        <p class="intro-text">A free and open-source XMPP chat client for your website</p>
                         <div class="page-scroll">
                             <a href="#about" class="btn btn-default btn-lg">Learn More</a>
                         </div>