Add badge with link to fediverse.

Author: dkocher

www/update/changelog.html

@@ -16,7 +16,23 @@
             padding: 15px 10px 15px 50px;
             background: #E5E5DB url(https://cdn.mountainduck.io/images/mountainduck_y_32.png) no-repeat 10px 10px;
             border: 1px solid #cccccc;
-            color: black;
+            color: #000;
+        }
+
+        p.mountainduck a:link, p.mountainduck a:visited {
+            color: #000;
+        }
+
+        p.mastodon {
+            display: block;
+            padding: 15px 10px 15px 50px;
+            background: #595aff url(https://cdn.cyberduck.io/img/1f9a3.svg) no-repeat 10px 10px;
+            border: 1px solid #cccccc;
+            color: #fff;
+        }
+
+        p.mastodon a:link, p.mastodon a:visited {
+            color: #fff;
         }
 
         .label-warning {
@@ -57,6 +73,10 @@
     explorer for Mac & Windows.
 </p>
 
+<p class="mastodon">
+    <strong><a target="_blank" href="https://fosstodon.org/@cyberduck">Follow us</a></strong> on Mastodon.
+</p>
+
 <p>
     <a target="_blank" href="https://trac.cyberduck.io/milestone/8.5.5"><strong>Version 8.5.5</strong></a>
 </p>