404s with new github repos (switch to `main` branch)

[madeleineostoja]

Sao seems to 404 error when trying to fetch recently created GitHub repos, because of the recent switch from master to main branches as the default.

Obviously an easy fix is just to push up a master branch, which fixes the issue. But it's a gotcha and Sao now fails out of the box with new repos

[egoist]

You can append a branch like this user/repo#main, maybe a better solution is to send a request to GitHub API to retrieve the default branch name.