root/pypi: links for welford

root/pypi welford-0.2.5.tar.gz
root/pypi welford-0.2.4.tar.gz
root/pypi welford-0.2.3.tar.gz
root/pypi welford-0.2.1.tar.gz
root/pypi welford-0.2.0.tar.gz
root/pypi welford-0.1.3.tar.gz
root/pypi welford-0.1.2.tar.gz
root/pypi welford-0.1.1.tar.gz
root/pypi welford-0.1.tar.gz