root/pypi: links for percentage

root/pypi percentage-0.0.0b4.tar.gz
root/pypi percentage-0.0.0b4-py3-none-any.whl
root/pypi percentage-0.0.0b1.tar.gz
root/pypi percentage-0.0.0b1-py3-none-any.whl
root/pypi percentage-0.0.0b0.tar.gz
root/pypi percentage-0.0.0b0-py3-none-any.whl