Rename master to main (#492)

Author: hugovk

pyproject.toml

@@ -8,7 +8,7 @@ author = "Larry Hastings"
 author-email = "[email protected]"
 maintainer = "Python Core Developers"
 maintainer-email = "[email protected]"
-home-page = "https://github.com/python/core-workflow/tree/master/blurb"
+home-page = "https://github.com/python/core-workflow/tree/main/blurb"
 requires-python = ">=3.7"
 description-file = "README.rst"
 classifiers = [