How to set option before connect but not in Vue.use ?

Look like #7 
But we need set option before connect but not in Vue.use

main.js
```
Vue.use(VueWebsocket, null, { autoConnect: false });
```

App.vue

```
created() {
        // Like this?  get the bar before connect
        this.$socket.option = {
               query: 'foo='+bar,
               'transports': ['websocket'],
        }
	this.$socket.open();
}
```

Thanks