Warning: `appendCallback` hook is deprecated

Hi,
When I add an image block by clicking "+" and selecting image, I get a warning:
```
`appendCallback` hook is deprecated and will be removed in the next major release. Use `rendered` hook instead
```

Indeed `appendCallback` is used here: https://github.com/editor-js/image/blob/25d46cd8d3930851b14ddc26ee80fb5b485e1496/src/index.js#L256-L265

You can reproduce it on Editorjs documentation demo: https://editorjs.io/.
It's not a big deal, just a warning in console, but I didn't see any issues already open so I thought I'd mention it.