root/pypi: links for pretf-helpers

root/pypi pretf_helpers-0.2.8.tar.gz
root/pypi pretf_helpers-0.2.8-py3-none-any.whl
root/pypi pretf_helpers-0.2.6.tar.gz
root/pypi pretf_helpers-0.2.6-py3-none-any.whl
root/pypi pretf_helpers-0.2.4.tar.gz
root/pypi pretf_helpers-0.2.4-py3-none-any.whl