Homebrew based installation of talisman binary on MacOS

[prateekbaheti]

Homebrew based installation would make it much simpler to install talisman on MacOS.

[svishwanath-tw]

@prateekbaheti : talisman now uses go modules and therefore defaults to go 1.11 for build and compile. Maybe the brew build will work now ?

[dAnjou]

There is a formula: https://github.com/Homebrew/homebrew-core/blob/master/Formula/talisman.rb. It's out of date though.

[dineshba]

Looks the formula is up to date. We can close this issue @harinee @svishwanath-tw

May be we can add about brew installation method in readme

[tinamthomas]

Closing this and creating an issue to add docs for homebrew installation.