Update gopackage/ddp to fix a problem with realtime client close

[RegularITCat]

Hi! First of all, thanks, that's a great project!

In realtime api there's a problem when client closes connection.

	RocketURL, err := url.Parse(c.RocketChatAddress)
	if err != nil {
		log.Println(err)
	}
	RocketClient, err := realtime.NewClient(RocketURL, false)
	if err != nil {
		log.Println(err)
	}
	RocketCreds := RocketModels.UserCredentials{ID: c.RocketXUserID, Token: c.RocketXAuthToken}
	_, err = RocketClient.Login(&RocketCreds)
	if err != nil {
		log.Println(err)
	}
	tmp := make(chan RocketModels.Message, 10)
	err = RocketClient.SubscribeToMyMessages(tmp)
	if err != nil {
		log.Println(err)
	}
	log.Println("Started connection with rocket chat")
	for {
		select {
		case msg := <-tmp:
			log.Println(msg)
			//TODO process msg using regexps, check in db all info, give it to user.
		case <-done:
			RocketClient.Close()
			return
		default:
		}
	}

In my case, i wanted to on receiving syscall sigterm safely close everything. And when i callled client close, i received in logger a problem like this

2023/02/06 16:54:48 Server is starting to accept connections
2023/02/06 16:54:48 About to connect to: wss://localhost:3000/websocket 3000 https
2023/02/06 16:54:48 Started connection with rocket chat
^C2023/02/06 16:55:05 Got SIGINT/SIGTERM, exiting.
2023/02/06 16:55:05 Inbox worker found nil event. May be due to broken websocket. Reconnecting.
exit status 1

When i started researching this undefined behavior, found this https://github.com/gopackage/ddp/pull/13 So, all work needed, is to update a library...