Change author_email to datetime-SIG

Author: pganssle

setup.cfg

@@ -6,7 +6,7 @@ long_description = file: README.md
 long_description_content_type = text/markdown
 url = https://github.com/python/tzdata
 author = Python Software Foundation
-author_email = paul@ganssle.io
+author_email = datetime-sig@python.org
 license = Apache-2.0
 license_file = LICENSE
 license_files =