make ipget available to install via brew

[wottpal]

that would be awesome. i'm new to go and have absolutely no clue where to start. i tried installing go with brew brew install go, but then the go get ... installation instruction gives me:

➜  test go get -d github.com/ipfs/ipget
go: go.mod file not found in current directory or any parent directory.
	'go get' is no longer supported outside a module.
	To build and install a command, use 'go install' with a version,
	like 'go install example.com/cmd@latest'
	For more information, see https://golang.org/doc/go-get-install-deprecation
	or run 'go help get' or 'go help install'.

[lidel]

@wottpal if you have time, these resources will provide you with a starting point :)

• https://docs.brew.sh/Adding-Software-to-Homebrew
• https://github.com/Homebrew/homebrew-cask/blob/master/CONTRIBUTING.md

[Wyatt-Stanke]

Done!
PR: Homebrew/homebrew-core#123685 (closed because of Homebrew's way of merging)
Cask: https://github.com/Homebrew/homebrew-core/blob/master/Formula/ipget.rb
brew.sh Page: https://formulae.brew.sh/formula/ipget#default

[pataquets]

+1 for also publishing built (static) binaries on Github Releases for all platforms (I'm on Linux)