loongson/pypi: links for mathmethods

loongson/mirror mathmethods-0.3.3.tar.gz
loongson/mirror mathmethods-0.3.2.tar.gz
loongson/mirror mathmethods-0.3.1.tar.gz
loongson/mirror mathmethods-0.3.tar.gz
loongson/mirror mathmethods-0.2.tar.gz