loongson/mirror: links for todo-placeholder

loongson/mirror todo_placeholder-2.0.1-py3-none-any.whl
loongson/mirror todo-placeholder-2.0.0.tar.gz
loongson/mirror todo-placeholder-1.0.1.tar.gz
loongson/mirror todo_placeholder-1.0.1-py3-none-any.whl
loongson/mirror todo-placeholder-1.0.0.tar.gz
loongson/mirror todo_placeholder-1.0.0-py3-none-any.whl