root/pypi: links for nstack

root/pypi nstack-0.2.1.tar.gz
root/pypi nstack-0.2.1-py3-none-any.whl
root/pypi nstack-0.2.tar.gz
root/pypi nstack-0.2-py2.py3-none-any.whl
root/pypi nstack-0.1.tar.gz