loongson/pypi: links for predata

loongson/mirror predata-2.1.0-py3-none-any.whl
loongson/mirror predata-2.0.0-py3-none-any.whl
loongson/mirror predata-2.0.0b2-py3-none-any.whl
loongson/mirror predata-2.0.0b1-py3-none-any.whl