root/pypi: links for libvisio-ng

root/pypi libvisio_ng-0.6.1.tar.gz
root/pypi libvisio_ng-0.6.1-py3-none-any.whl
root/pypi libvisio_ng-0.6.0.tar.gz
root/pypi libvisio_ng-0.6.0-py3-none-any.whl