root/pypi: links for cbf-opt

root/pypi cbf_opt-0.6.0.tar.gz
root/pypi cbf_opt-0.6.0-py3-none-any.whl
root/pypi cbf_opt-0.4.0.tar.gz
root/pypi cbf_opt-0.4.0-py3-none-any.whl