root/pypi: links for pdfxcb

root/pypi pdfxcb-3.0.0.tar.gz
root/pypi pdfxcb-3.0.0-py3-none-any.whl
root/pypi pdfxcb-0.1.tar.gz
root/pypi pdfxcb-0.1-py3-none-any.whl