loongson/pypi: links for pontipy

loongson/mirror pontiPy-3.0.tar.gz
loongson/mirror pontiPy-3.0-py3.7.egg
loongson/mirror pontiPy-3.0-py3-none-any.whl
loongson/mirror pontiPy-2.6.tar.gz
loongson/mirror pontiPy-2.6-py3-none-any.whl