Update README.md

[vvrmatos]

Error: brew cask is no longer a brew command. Use brew <command> --cask instead.

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[vvrmatos]

Error: brew cask is no longer a brew command. Use brew <command> --cask instead.

The old brew cast is not longer functioning.

[vvrmatos]

Error: brew cask is no longer a brew command. Use brew <command> --cask instead.