docs: update logo url

Author: daviddias

README.md

@@ -1,5 +1,5 @@
 <h1 align="center">
-  <a href="libp2p.io"><img width="250" src="https://github.com/libp2p/libp2p/blob/master/logo/alternates/libp2p-logo-alt-2.png?raw=true" alt="libp2p hex logo" /></a>
+  <a href="libp2p.io"><img width="250" src="https://github.com/libp2p/libp2p/blob/master/logo/black-bg-2.png?raw=true" alt="libp2p hex logo" /></a>
 </h1>
 
 <h3 align="center">The JavaScript implementation of the libp2p Networking Stack.</h3>