Show HN: UpgradeCLI: A Go pkg to add an upgrade sub-command to your CLI

I think it's a nice DX when CLI's add an `upgrade` sub-command and present users with a simple and automatic way of updating to the newest version.

That's why I built UpgradeCLI. Any Go cli can adopt it and have a working upgrade sub-command in a matter of minutes.

Let me know what y'all think.