loongson/mirror: links for sn-edx-middleware

loongson/mirror sn-edx-middleware-0.0.4.tar.gz
loongson/mirror sn-edx-middleware-0.0.3.tar.gz
loongson/mirror sn-edx-middleware-0.0.2.tar.gz
loongson/mirror sn-edx-middleware-0.0.1.tar.gz