Add 3.0.4 release

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

index.html

@@ -61,9 +61,9 @@
         </section>
 
         <aside id="sidebar">
-          <a href="https://github.com/corosync/corosync/releases/download/v3.0.3/corosync-3.0.3.tar.gz" class="button">
+          <a href="https://github.com/corosync/corosync/releases/download/v3.0.4/corosync-3.0.4.tar.gz" class="button">
             <small>Download latest stable</small>
-            camelback release <small>3.0.3</small>
+            camelback release <small>3.0.4</small>
           </a>
           <a href="https://github.com/corosync/corosync/releases/download/v2.4.5/corosync-2.4.5.tar.gz" class="button">
             <small>Download latest stable</small>