loongson/pypi: links for rigidity

loongson/mirror Rigidity-1.4.0.tar.gz
loongson/mirror rigidity-1.3.0.tar.gz
loongson/mirror Rigidity-1.2.0.tar.gz
loongson/mirror Rigidity-1.1.0.tar.gz
loongson/mirror rigidity-1.0.0.tar.gz
loongson/mirror Rigidity-0.8.1.tar.gz