root/pypi: links for download-manager

root/pypi download_manager-1.0.0b2.tar.gz
root/pypi download_manager-1.0.0b2-py3-none-any.whl
root/pypi download_manager-1.0.0b1.tar.gz
root/pypi download_manager-1.0.0b1-py3-none-any.whl