Update README.md

Author: typicode

README.md

@@ -52,7 +52,7 @@ See also:
 <p>&nbsp;</p>
 
 <p align="center">
-  <a href="https://flowdash.com" target="_blank">
+  <a href="https://flowdash.com?utm_source=json_server&utm_medium=sponsor&utm_campaign=github" target="_blank">
     <img src="https://jsonplaceholder.typicode.com/Flowdash-logo-text.png" height="70px">
   </a>
 </p>