loongson/pypi: links for public-dropbox-urls

loongson/mirror public-dropbox-urls-0.0.0.4.tar.gz
loongson/mirror public-dropbox-urls-0.0.0.3.tar.gz
loongson/mirror public-dropbox-urls-0.0.0.2.tar.gz
loongson/mirror public-dropbox-urls-0.0.0.1.tar.gz