more robust (but GitHub-specific) update check?

[neogeographica]

Currently the update check just scrapes a webpage for links. So it works pretty well, and would theoretically work with non-GitHub release pages if I had to relocate these releases for some reason, but it's not super robust (and in fact has already been temporarily broken once by GitHub changes).

An alternative would be to hit the GitHub API, i.e. https://api.github.com/repos/neogeographica/quakestarter/releases . Downsides: would have to parse JSON (using PowerShell) and would be locked to only working with GitHub.