loongson/pypi: links for nat

loongson/mirror nat-0.4.3.tar.gz
loongson/mirror nat-0.4.3-py3-none-any.whl
loongson/mirror nat-0.4.2.tar.gz
loongson/mirror nat-0.4.2-py3-none-any.whl
loongson/mirror nat-0.4.1.tar.gz
loongson/mirror nat-0.4.1-py3-none-any.whl
loongson/mirror nat-0.3.5.tar.gz