docs: fix usage example

Reference: https://github.com/redis/node-redis/blob/master/docs/client-configuration.md

Related: #5

Author: darrachequesne

README.md

@@ -43,7 +43,7 @@ import { createClient } from "redis";
 import { Server } from "socket.io";
 import { createAdapter } from "@socket.io/redis-streams-adapter";
 
-const redisClient = createClient({ host: "localhost", port: 6379 });
+const redisClient = createClient({ url: "redis://localhost:6379" });
 
 await redisClient.connect();