Update footer.html

Author: andrew-codechimp

_includes/footer.html

@@ -16,7 +16,7 @@
 
         <div class="social-links">
             {%- include social.html -%}
-            <ul><li><a rel="me" href="https://mastodon.online/@codechimp">Mastodon</a><svg class="svg-icon"><use xlink:href="/assets/minima-social-icons.svg#mastodon"></use></svg> <span class="username">codechimp</span></a></li></ul>
+            <ul class="social-media-list"><li><a rel="me" href="https://mastodon.online/@codechimp"><svg class="svg-icon"><use xlink:href="/assets/minima-social-icons.svg#mastodon"></use></svg> <span class="username">codechimp</span></a></li></ul>
         </div>
 
         <div class="copyright">