Twine version 1.11.0rc1

* #320 Remove PyPI as default ``register`` package index.
* #319 Support Metadata 2.1 (PEP 566), including Markdown
for description fields.
* #318 [Update PyPI URLs](https://packaging.python.org/guides/migrating-to-pypi-org/).

More in https://twine.readthedocs.io/en/latest/changelog.html .