loongson/pypi: links for prettytime

loongson/mirror prettytime-0.0.5.tar.gz
loongson/mirror prettytime-0.0.4.tar.gz
loongson/mirror prettytime-0.0.3.tar.gz
loongson/mirror prettytime-0.0.2.tar.gz
loongson/mirror prettytime-0.0.1.tar.gz