Running sketchtool from inside skpm plugin causes kernel panic
In a plugin trying to do:

```
const absolutePath = sketch.fromNative(context.document).path;

execSync(`/Applications/Sketch.app/Contents/Resources/sketchtool/bin/sketchtool export slices ${absolutePath} --output ~/Desktop/ --format="png" --scales="1, 2, 3"`);
```

caused my laptop to freeze after 2 minutes when the plugin was in watch mode with npm start and then dimmed my screen, and caused a kernel panic.

Just before the panic I opened terminal and immediately got a bash warning: bash using to much resources on same file.