root/pypi: links for sbpipe

root/pypi sbpipe-4.21.0.tar.gz
root/pypi sbpipe-4.20.0.tar.gz
root/pypi sbpipe-4.19.0.tar.gz
root/pypi sbpipe-4.18.0.tar.gz
root/pypi sbpipe-4.15.0.tar.gz