loongson/pypi: links for devpi-slack

loongson/mirror devpi-slack-0.1.4.tar.gz
loongson/mirror devpi-slack-0.1.3.tar.gz
loongson/mirror devpi-slack-0.1.2.tar.gz
loongson/mirror devpi-slack-0.1.1.tar.gz
loongson/mirror devpi-slack-0.1.0.tar.gz