loongson/pypi: links for black
INFO: Because this project isn't in the mirror_whitelist, no releases from root/pypi are included.
loongson/pypi black-20.8b1.tar.gz
loongson/pypi black-20.8b1-py3-none-any.whl
loongson/pypi black-19.3b0-py36-none-any.whl