loongson/pypi: links for captricity-python-client

loongson/mirror captricity-python-client-0.21.tar.gz
loongson/mirror captricity-python-client-0.20.tar.gz
loongson/mirror captricity-python-client-0.19.tar.gz
loongson/mirror captricity-python-client-0.18.tar.gz