root/pypi: links for colcon-clean

root/pypi colcon-clean-0.2.1.tar.gz
root/pypi colcon_clean-0.2.1-py3-none-any.whl
root/pypi colcon-clean-0.2.0.tar.gz
root/pypi colcon_clean-0.2.0-py3-none-any.whl