Plugin installed but not working on Sketch 3.8.2
Hi,

I just installed this plugin on my Sketch version 3.8.2 but I keep getting an error message on every action the plugin allows me to do (e.g. init the repo).

```
{
    column = 37;
    line = 37;
    sourceURL = "/Users/pascal/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/Init.cocoascript";
}
```
