root/pypi: links for vecstack

root/pypi vecstack-0.4.0.tar.gz
root/pypi vecstack-0.3.0.tar.gz
root/pypi vecstack-0.2.2.tar.gz
root/pypi vecstack-0.2.1.tar.gz
root/pypi vecstack-0.2.tar.gz
root/pypi vecstack-0.1.zip