Add inverse byline.

src/templates/brand_heading.html

@@ -1 +1,4 @@
-<h1 class="brand-heading"><i class="icon-conversejs"></i> inVerse</h1>
+<span>
+    <h1 class="brand-heading"><i class="icon-conversejs"></i> inVerse</h1>
+    <p><a href="https://github.com/jcbrand/converse.js">Open Source</a> XMPP chat client</p>
+<span>