fix formatting of README on pypi about mdanalysisdata

[orbeckst]

Nope, this is already present at

MDAnalysisData/setup.py

Line 61 in eb983cb

long_description_content_type='text/markdown',

[orbeckst]

How can I test if README.md will render correctly on PyPi?

(I know how to do it for reST...)

[orbeckst]

The answer from https://pypi.org/project/readme_renderer/

Checking your Markdown long descriptions is unecessary, because unlike rST, where a properly rendered description is all-or-nothing, PyPI will still render your Markdown description as Markdown if it has some invalid or incorrect syntax.

This does not appear to be true, though, because at the moment, our README.md is rendered as plain text.

[orbeckst]

Note that the previous 0.1.1 release rendered fine: https://pypi.org/project/MDAnalysisData/0.1.1/ ... without any changes to the file since. ?!?!?

[orbeckst]

There was a hic-up during twine upload (the first one was killed because I wrongly included some distributions with non-release tags) so perhaps pypi got mixed up. Maybe it will all look fine on the next release.

[orbeckst]

Looks fine for 0.2.1.