Change GitHub default "Master" branch to "Main"

maindefault.md

For those who would like to change the default master branch in GitHub to something else, here using main instead:

1. Make sure you're up-to-date: git checkout master; git fetch; git pull
2. Rename the branch: git branch -m main
3. Push the change: git push -u origin main
4. No PR is needed
5. In the GitHub UI for the REPO being changed: Settings → Branches → Default branch
6. Select main from the drop-down menu, click Update
7. Browse to https://github.com/USER/REPO/branches
8. Click the red trashcan next to master