Update index.html

Add clustrmaps:
https://clustrmaps.com/profile/1c6il/widget/customize

Author: ktwu01

index.html

@@ -186,6 +186,8 @@
                 Copyright © ut01 {{ site.time | date: "%Y" }}, inspired by projects like <a href="https://github.com/SmartHypercube/ustclife" target="_blank" rel="noopener noreferrer">SmartHypercube/ustclife</a>. For errors or to suggest a link, please <a href="https://github.com/ut01/ut01.github.io/issues" target="_blank" rel="noopener noreferrer">create an issue</a>.
                 </div>
         </div>
+        <!-- https://clustrmaps.com/profile/1c6il/widget/customize -->
+        <script type='text/javascript' id='clustrmaps' src='//cdn.clustrmaps.com/map_v2.js?cl=a5a0a0&w=a&t=tt&d=fQvKmZbPMctrjCs0jp8rDLqKYPwmQtmFVMiOSl9YUsE&co=f1f1f1&cmo=bc3a3a&cmn=1fd31f&ct=808080'></script>
     </body>
     <script>
         var setHome = function(obj, url) {