number+gg will jump to the (number+1) line

I think this's a bug and can be fixed by changing these lines https://github.com/tony612/vim-mode/blob/show-cursor-just-in-focused-editor/lib/motions.coffee#L339..L341 to 
```coffeescript
class MoveToStartOfFile extends MoveToLine
  getDestinationRow: (count=1) ->
    count - 1
```
Any idea?