loongson/pypi: links for tar-diff

loongson/mirror tar-diff-2020.12.3.tar.gz
loongson/mirror tar-diff-2020.7.1.tar.gz
loongson/mirror tar-diff-2019.4.13.tar.gz
loongson/mirror tar-diff-2019.3.23.tar.gz
loongson/mirror tar_diff-2019.3.23-py2.py3-none-any.whl
loongson/mirror tar-diff-2019.3.22.tar.gz
loongson/mirror tar_diff-2019.3.22-py2.py3-none-any.whl