root/pypi: links for stl2mask

root/pypi stl2mask-0.1.0.tar.gz
root/pypi stl2mask-0.1.0-py3-none-any.whl
root/pypi stl2mask-0.1.0b0.tar.gz
root/pypi stl2mask-0.1.0b0-py3-none-any.whl