root/pypi: links for prerelease-example

root/pypi prerelease-example-1.0.0b0.tar.gz
root/pypi prerelease_example-1.0.0b0-py3-none-any.whl
root/pypi prerelease-example-0.0.0.tar.gz
root/pypi prerelease_example-0.0.0-py3-none-any.whl