Fix new Socket constructor

lib/client/websocket-tracker.js

@@ -188,7 +188,7 @@ class WebSocketTracker extends Tracker {
           agent = new Socks.Agent(clone(this.client._proxyOpts.socksProxy), (parsedUrl.protocol === 'wss:'))
         }
       }
-      this.socket = socketPool[this.announceUrl] = new Socket(this.announceUrl, { agent: agent })
+      this.socket = socketPool[this.announceUrl] = new Socket({ url: this.announceUrl, agent: agent })
       this.socket.consumers = 1
       this.socket.once('connect', this._onSocketConnectBound)
     }