Feature Request: Update mechanism for Windows and macOS

[vicajilau]

First of all, amazing work on this repository! Microsoft's decision not to officially support Linux made me abandon the original GitHub Desktop, so finding a fork that not only includes Linux support but also introduces new features is fantastic.

I was wondering if there is currently an update mechanism for platforms outside of Linux (specifically Windows and macOS) that allows users to easily detect new versions? If not, I would love to suggest adding a built-in update checker for those operating systems.

Thanks again for your hard work!

[pol-rivero]

Currently, the plan is to use Homebrew for macOS (issue #25) and Winget for Windows (PR #77).

• Windows (Winget): We are currently waiting for Microsoft to review @guplem's submission. If things move quickly, we could have automatic releases as soon as the next release (v3.5.6.6).
  I think Winget doesn't provide autoupdate functionality out of the box, but tools like Winget-AutoUpdate can fill that gap.
  Edit: My bad, Winget does support upgrading all packages, just like any other package manager. Just make sure to run winget upgrade --all periodically.
• macOS (Homebrew): If nobody contributes a working (and tested) cask first, I'll do it myself around June or July. Right now I'm quite busy and don't have an easy way of testing it.