root/pypi: links for gretry

root/pypi gretry-2.0.6.tar.gz
root/pypi gretry-2.0.5.tar.gz
root/pypi gretry-2.0.4.tar.gz
root/pypi gretry-2.0.3.tar.gz
root/pypi gretry-2.0.2.tar.gz
root/pypi gretry-2.0.1.tar.gz
root/pypi gretry-2.0.0.tar.gz