update cask install instructions in README (#14452)

* use 'brew install --cask'

the latest versions of homebrew use the syntax 'brew install --cask' instead of 'brew cask install'

* Update README.md
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Chris 2021-03-14 00:16:16 +01:00 committed by GitHub
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@ -184,6 +184,12 @@ Homebrew now recommends to use the cask version with the following message:
"Please try the Cask for a better-supported Cocoa version". To install the cask
version:
```
brew install --cask emacs
```
or in older versions of homebrew
```
brew cask install emacs
```