root/pypi: links for natural-questions

root/pypi natural-questions-1.0.6.tar.gz
root/pypi natural_questions-1.0.6-py2.py3-none-any.whl
root/pypi natural-questions-1.0.5.tar.gz
root/pypi natural_questions-1.0.5-py2.py3-none-any.whl
root/pypi natural-questions-1.0.4.tar.gz
root/pypi natural_questions-1.0.4-py2.py3-none-any.whl