root/pypi: links for nbserve

root/pypi nbserve-0.4.1.tar.gz
root/pypi nbserve-0.3.1.tar.gz
root/pypi nbserve-0.2.0.tar.gz
root/pypi nbserve-0.1.1.tar.gz
root/pypi nbserve-0.1.0.tar.gz