Update download link to version 0.4

index.html

@@ -19,8 +19,8 @@
         <h1 id="project_title"><a href="http://conversejs.org">Converse.js</a></h1>
         <h2 id="project_tagline">An XMPP chat client for your website</h2>
         <section id="downloads">
-            <a class="zip_download_link" href="https://github.com/jcbrand/converse.js/archive/v0.3.zip">Download the latest release as a .zip file</a>
-            <a class="tar_download_link" href="https://github.com/jcbrand/converse.js/archive/v0.3.tar.gz">Download the latest release as a tar.gz file</a>
+            <a class="zip_download_link" href="https://github.com/jcbrand/converse.js/archive/v0.4.zip">Download the latest release as a .zip file</a>
+            <a class="tar_download_link" href="https://github.com/jcbrand/converse.js/archive/v0.4.tar.gz">Download the latest release as a tar.gz file</a>
         </section>
     </header>
     </div>