chore: update the URL of the module

Author: darrachequesne

README.md

@@ -22,7 +22,7 @@ Table of content:
 
 ```ts
 import { serve } from "https://deno.land/[email protected]/http/server.ts";
-import { Server } from "https://deno.land/x/socket.io@0.1.0/mod.ts";
+import { Server } from "https://deno.land/x/socket_io@0.1.0/mod.ts";
 
 const io = new Server();