loongson/mirror: links for docmerge

loongson/mirror docmerge-1.0.0.tar.gz
loongson/mirror docmerge-1.0.0-py3-none-any.whl
loongson/mirror docmerge-0.0.0.tar.gz
loongson/mirror docmerge-0.0.0-py3-none-any.whl