loongson/pypi: links for flatten-utils

loongson/mirror flatten_utils-0.1.3.tar.gz
loongson/mirror flatten_utils-0.1.3-py3-none-any.whl
loongson/mirror flatten_utils-0.1.2.tar.gz
loongson/mirror flatten_utils-0.1.2-py3-none-any.whl