Install Documentation Update: '--cask' not 'cask'

[ghost]

The more we know about your system and use case, the more easily and likely we can help.

Environment info

• OS: Mac OS XI
• App Version: N/A

Description of the problem / feature request / question:

GitHub install instructions read:

Install via Homebrew (macOS)

brew cask install lepton

As of brew 2.7.0, per this brew issue

brew cask <command> was deprecated in favor of brew <command> --cask

Install documentation should reflect this change.

Log

==> Tapping homebrew/cask Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask'... remote: Enumerating objects: 35, done. remote: Counting objects: 100% (35/35), done. remote: Compressing objects: 100% (25/25), done. remote: Total 548126 (delta 16), reused 21 (delta 10), pack-reused 548091 Receiving objects: 100% (548126/548126), 241.73 MiB | 1.46 MiB/s, done. Resolving deltas: 100% (387090/387090), done. Tapped 3806 casks (3,927 files, 259.3MB). Error: Calling brew cask install is disabled! Use brew install [--cask] instead.

[JohannesFischer]

Looks like this has already been updated: https://github.com/hackjutsu/Lepton#installation