root/pypi: links for powernad

root/pypi powernad-0.8.0.tar.gz
root/pypi powernad-0.8.0-py3-none-any.whl
root/pypi powernad-0.7.1.tar.gz
root/pypi powernad-0.6.6.tar.gz
root/pypi powernad-0.6.5.tar.gz