Merge pull request #51 from geerlingguy/highsierra-10.13-and-docs

Add support for High Sierra 10.13 and update README

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

Eject macOs installer disk if its still open

Fixes #16: Bump minimum recommended VRAM requirement to 128MB.

Merge pull request #3 from MatthiasWinkelmann/master

Updates and improvements for macOS Sierra