loongson/pypi: links for mailgun3

loongson/mirror mailgun3-0.1.9.tar.gz
loongson/mirror mailgun3-0.1.8.tar.gz
loongson/mirror mailgun3-0.1.7.tar.gz
loongson/mirror mailgun3-0.1.6.tar.gz
loongson/mirror mailgun3-0.1.5.tar.gz