The pypi 2.3.0 release includes only a wheel for download but does not include a source tarball.
Thanks.
There must have been some delay. The sdist tarball is now available from the PyPI project page for version 2.3.0.
Metadata Update from @bignose: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)
Thank you! I can confirm that I see (and can fetch) it now.