Update jQuery in tail.html (#1582)

This replaces an insecure version of jQuery and will make it possible to fix issues such as Pr0methean/SiteF1BackEnd#3 by updating to the next release.

docs/tail.html

@@ -1,6 +1,6 @@
     </div>
     <a href="http://github.com/visionmedia/superagent"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_white_ffffff.png" alt="Fork me on GitHub"></a>
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
     <script>
       $('code').each(function(){
         $(this).html(highlight($(this).text()));