bug: upload to pypi failed

[sbillinge]

Problem

please see here: https://github.com/diffpy/diffpy.stretched-nmf/actions/runs/23009177484/job/66814677559

Proposed solution

this is often some kind of malformed md or rst in the readme or something like that but @john-halloran please take a look and see if you can figure it out.

[john-halloran]

Should be addressed by #196. Will be sure after running the action again.