Mac Finder Preview para Markdown
$ brew update
$ brew cask install qlmarkdown
# REF: https://github.com/toland/qlmarkdown/issues/98#issuecomment-612259027
KostasX
$ brew update
$ brew cask install qlmarkdown
# REF: https://github.com/toland/qlmarkdown/issues/98#issuecomment-612259027