:bug: Fix issue caused by breaking change in fs-plus
:bug: Fix issue caused by breaking change in fs-plus

There was a breaking change introduced in fs-plus v2.8.0, specifically
in commit https://github.com/atom/fs-plus/commit/c3ec708.

Resolves #78

thomasjo/atom-latex,WoodyWoodsta/atom-latex,thomasjo/atom-latex,WoodyWoodsta/atom-latex,thomasjo/atom-latex