root/pypi: links for testing-v1beta3-googledatastore

root/pypi testing-v1beta3-googledatastore-4.0.0b4.tar.gz
root/pypi testing-v1beta3-googledatastore-4.0.0b3.tar.gz
root/pypi testing-v1beta3-googledatastore-4.0.0b2.tar.gz