Default branch renamed from `master` to `main`

[duckinator]

I renamed the default branch from master to main.

If you have a local clone, you can update it by running:

git branch -m master main
git fetch origin
git branch -u origin/main main

If you've run into problems because of it, please check the fantastic thread by \@theavalkyrie on Twitter or leave a comment here and I'll give you a hand sorting it out. :heart:

[duckinator]

@nbraud your PR was automagically updated to be against main, but you will need to update your local copy (if you have one). 💜