Currently we use brew upgrade gh --fetch-HEAD to upgrade GH, which is hard to remember and means letting the entire script run just to see the build is already installed:

Warning: github/gh/gh 0.3.5 already installed

or we end up with an upgraded build with an unclear success message.

Perhaps we could mask the brew command with gh upgrade to keep it easier to remember and allow us to control the output?

Some benefits:

• If homebrew was not installed, we could inform the user with instructions. Could be platform/method specific.
• If the current build was already installed, we could inform the user before the script ran
• It could allow the user to switch builds if we go this route