Merge pull request geerlingguy#51 from geerlingguy/highsierra-10.13-a…

…nd-docs

Add support for High Sierra 10.13 and update README

Merge pull request geerlingguy#12 from O-kasso/eject-installer

Eject macOs installer disk if its still open

Fixes geerlingguy#16: Bump minimum recommended VRAM requirement to 12…

…8MB.

Merge pull request geerlingguy#3 from MatthiasWinkelmann/master

Updates and improvements for macOS Sierra