root/pypi: links for pep-517-example

root/pypi pep_517_example-1-2-py3-none-any.whl
root/pypi pep_517_example-1-3-py3-none-any.whl
root/pypi pep_517_example-1-4-py3-none-any.whl
root/pypi pep_517_example-1-py3-none-any.whl