现在还有人在维护吗，使用standalone，在stage下面使用addChild的话会报错

```
Uncaught TypeError: child._render is not a function
    at constructor.render (hilo-standalone.js:3204:45)
    at constructor._render (hilo-standalone.js:2597:18)
    at constructor.tick (hilo-standalone.js:3355:18)
    at constructor._tick (hilo-standalone.js:5498:28)
    at runLoop (hilo-standalone.js:5430:22)
```
好像是库自己本身的问题？