Hi,

Whilst working on the Reproducible Builds effort [0], we noticed that
mkdocs-include-markdown-plugin could not be built reproducibly.

This is because the testsuite also generates a foo/ directory that
gets installed to /usr/lib/python3/dist-packages (!).

Patch attached that removes this in PYBUILD_AFTER_TEST.

 [0] https://reproducible-builds.org/


Regards,