Use dark logo for readme

Author: jdalton

README.md

@@ -113,6 +113,6 @@ npm exec socket
   <picture>
     <source media="(prefers-color-scheme: dark)" srcset="logo-dark.png">
     <source media="(prefers-color-scheme: light)" srcset="logo-light.png">
-    <img width="324" height="108" alt="Socket Logo" src="logo-light.png">
+    <img width="324" height="108" alt="Socket Logo" src="logo-dark.png">
   </picture>
 </div>