Can't install
My system:
• OS X v10.11.5
• Sketch v44.1

Hi there. 

Thanks for writing this plugin!

I noticed you addressed this issue in your FAQ but the answer didn't address my issue.

I've tried installing v0.11.2 of your plugin (from [here](https://github.com/mathieudutour/git-sketch-plugin/releases/tag/v0.11.2)) but it never appears in my Plugins menu.

It also never gets added the my Plugins folder (/Users/marcomendoza/Library/Application Support/com.bohemiancoding.sketch3).
