root/pypi: links for downstream-farmer

root/pypi downstream-farmer-0.1.8.zip
root/pypi downstream-farmer-0.1.7.tar.gz
root/pypi downstream-farmer-0.1.5.tar.gz
root/pypi downstream-farmer-0.1.4.tar.gz
root/pypi downstream-farmer-0.1.3.1.tar.gz