loongson/pypi: links for prov-exscript

loongson/mirror Prov_Exscript-2.0-py3-none-any.whl
loongson/mirror Prov_Exscript-1.0.4-py3-none-any.whl
loongson/mirror Prov_Exscript-1.0-py3-none-any.whl