root/pypi: links for pythtb

root/pypi pythtb-2.0.0.tar.gz
root/pypi pythtb-2.0.0-py3-none-any.whl
root/pypi pythtb-1.8.0.tar.gz
root/pypi pythtb-1.7.2.tar.gz
root/pypi pythtb-1.7.1.tar.gz