setup.py: Add `versioneer.py` to `sphinx-apidoc`'s skipped files.
setup.py: Add `versioneer.py` to `sphinx-apidoc`'s skipped files.

DudLab/nanshe,DudLab/nanshe,jakirkham/nanshe,jakirkham/nanshe,nanshe-org/nanshe,nanshe-org/nanshe