Rename `master` to `main` about lumispy HOT 3 CLOSED

If no one objects, I would wait a few days and then do the rename.

from lumispy.

Done.

Everyone locally still using the master branch now needs to rename their local clones:

git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a

from lumispy.

And rename the branch name in your fork of course.

from lumispy.