It's very strenuous while select multiple icons at the same time
Although it is much easier to use than other plugin like `sketch-material.sketchplugin`, the downside is it could not select multiple icons at the same time.
![image](https://user-images.githubusercontent.com/36031579/90603191-7dc9bc00-e22d-11ea-9bc7-ea9bbc61f380.png)

I've tried to prevent stopModal use comment the following code(FIle is : `iconfont.sketchplugin/Sketch/add_grid.js`), but it does not work: 

```js
cell.setCOSJSTargetFunction(function(sender) {
     // wrapper.window.orderOut(nil)
     // NSApp.stopModalWithCode(NSOKButton)
})
```