loongson/pypi: links for slingshot-lawdocs

loongson/mirror slingshot-lawdocs-0.5.5.tar.gz
loongson/mirror slingshot-lawdocs-0.5.4.tar.gz
loongson/mirror slingshot-lawdocs-0.5.3.tar.gz
loongson/mirror slingshot-lawdocs-0.5.3a1.tar.gz
loongson/mirror slingshot-lawdocs-0.5.2.tar.gz
loongson/mirror slingshot-lawdocs-0.5.1.tar.gz
loongson/mirror slingshot-lawdocs-0.5.tar.gz