Changes from Homebrew 2.7 release on 2020-12-01

[nikeyes]

Hi guys!

I used your repo for inspiration for my new dotfiles and I've founded a deprecated commands in your scripts.

I have changed and tested this changes.

I have also improved the python package update

Thanks for your work! 🤩

Homebrew reference: https://brew.sh/2020/12/01/homebrew-2.6.0/ All brew cask commands have been deprecated in favour of brew commands (with --cask) when necessary

[Yusuke1998]

Excelente.