loongson/pypi: links for release-tools

loongson/mirror release_tools-0.6.0.tar.gz
loongson/mirror release_tools-0.6.0-py3-none-any.whl
loongson/mirror release_tools-0.6.0rc2.tar.gz
loongson/mirror release_tools-0.6.0rc2-py3-none-any.whl
loongson/mirror release-tools-0.4.0.tar.gz
loongson/mirror release_tools-0.4.0-py3-none-any.whl
loongson/mirror release-tools-0.3.0.tar.gz
loongson/mirror release_tools-0.3.0-py3-none-any.whl