loongson/pypi: links for downsample

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