Update logo.

Author: ghengeveld

README.md

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-<br/>
-<p align="center">
-  <a href="https://github.com/ghengeveld/react-async"><img src="./react-async.png" width="435" /></a>
-</p>
 <p align="center">
+  <a href="https://github.com/ghengeveld/react-async"><img src="./react-async.png" width="520" alt="React Async" /></a><br/>
   Handle promises with ease.
 </p>
 <br/>