root/pypi: links for pkg-metadata

root/pypi pkg_metadata-0.3.tar.gz
root/pypi pkg_metadata-0.3-py2.py3-none-any.whl
root/pypi pkg_metadata-0.2.tar.gz
root/pypi pkg_metadata-0.2-py3-none-any.whl
root/pypi pkg_metadata-0.1.tar.gz
root/pypi pkg_metadata-0.1-py3-none-any.whl