Update install.md: Install via brew

[guettli]

I think installing via brew is the most straight forward way and works on most OSs (Mac, Linux, WSL).

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[ahmetb]

It's not a fair assumption that Homebrew is the most widely used package manager across distros.

Separately, Krew installs and updates itself as a plugin. And we don't actively maintain the Brew formulae as part of our releases (Brew community does the upkeep of the formula.)

So I'm -1 on placing it on the top as the recommended way.

[kundan2707]

/lgtm

[kundan2707]

/remove-lgtm

[guettli]

@ahmetb thank you for your feedback. I discovered that if I install via brew, then the shell autocomplete gets added automatically. AFAIK this is not possible with krew. At the moment I don't see a reason to use krew. I close the issue. But again, thank you for your feedback.