Remove CodeFund ad because it violates GitHub TOS.

Author: ghengeveld

README.md

@@ -1,11 +1,6 @@
 <p align="center">
   <a href="https://react-async.dev"><img src="https://raw.githubusercontent.com/async-library/react-async/HEAD/react-async.png" width="520" alt="React Async" /></a><br/>
   Handle promises with ease.
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-  <br/>
-  <a href="https://codefund.io/properties/458/visit-sponsor">
-    <img src="https://codefund.io/properties/458/sponsor" />
-  </a>
 </p>
 <br/>