root/pypi: links for collective-cron

root/pypi collective.cron-2.8.tar.gz
root/pypi collective.cron-2.7.zip
root/pypi collective.cron-2.6.zip
root/pypi collective.cron-2.5.zip
root/pypi collective.cron-2.4.zip
root/pypi collective.cron-2.3.zip
root/pypi collective.cron-2.2.zip
root/pypi collective.cron-2.1.zip
root/pypi collective.cron-2.0.zip