root/pypi: links for ubuntu-release-info

root/pypi ubuntu-release-info-21.1.tar.gz
root/pypi ubuntu-release-info-20.2.tar.gz
root/pypi ubuntu-release-info-20.1.tar.gz
root/pypi ubuntu-release-info-19.1.tar.gz
root/pypi ubuntu-release-info-18.2.tar.gz
root/pypi ubuntu-release-info-18.1.tar.gz
root/pypi ubuntu-release-info-18.0.tar.gz