Add Flattr link to front page

index.html

@@ -262,8 +262,9 @@
     (<span onclick="document.getElementById('paypal').submit();"
     class="quasilink">Paypal</span>,
     <span onclick="document.getElementById('bankinfo').style.display = 'block';"
-           class="quasilink">bank</span>, or
-    <a href="https://www.gittip.com/marijnh">Gittip</a>)</li>
+           class="quasilink">bank</span>,
+    <a href="https://www.gittip.com/marijnh">Gittip</a>, or
+    <a href="https://flattr.com/profile/marijnh">Flattr</a>)</li>
     <li>Purchase <a href="#commercial">commercial support</a></li>
   </ul>