Rendering markdown for PyPI

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For some reason Markdown does not render on https://pypi.org/project/livelossplot/.
I have no idea why - I did follow the guidelines in setup.py:

long_description=readme(),
long_description_content_type='text/markdown'

Vide:

• https://packaging.python.org/guides/making-a-pypi-friendly-readme/
• https://dustingram.com/articles/2018/03/16/markdown-descriptions-on-pypi
• PyPI should render readmes written in Markdown pypa/packaging-problems#46
• long_description_content_type=text/markdown doesn't always work pypi/warehouse#3664
• Markdown long description on wheel rendered as restructured text pypi/warehouse#3438

(I do have up-to-date versions of twine, setuptools and wheel )

EDIT: Most likely an error with twine: pypa/twine#420 (there is a fix, but not yet released).

Any help appreciated!

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Update: twine=1.12.1 did cause this error.

After installing pip install git+git://github.com/pypa/twine@master (twine=1.12.2, not yet released) it works.