loongson/pypi: links for mathnexus

loongson/mirror mathnexus-0.3.8.tar.gz
loongson/mirror mathnexus-0.3.8-py3-none-any.whl
loongson/mirror mathnexus-0.3.4.tar.gz
loongson/mirror mathnexus-0.3.4-py3-none-any.whl
loongson/mirror mathnexus-0.3.3.tar.gz
loongson/mirror mathnexus-0.3.3-py3-none-any.whl
loongson/mirror mathnexus-0.1.5.tar.gz
loongson/mirror mathnexus-0.1.5-py3-none-any.whl