root/pypi: links for nlu-dev

root/pypi nlu_dev-5.1.5rc20.tar.gz
root/pypi nlu_dev-5.1.5rc20-py3-none-any.whl
root/pypi nlu_dev-5.1.5rc19.tar.gz
root/pypi nlu_dev-5.1.5rc19-py3-none-any.whl