Update skrf/network.py
Update skrf/network.py

Co-authored-by: Julien Hillairet <3cbbad5671816685da2cca3d9f220366f5d62d7d@gmail.com>
scikit-rf/scikit-rf,jhillairet/scikit-rf,jhillairet/scikit-rf,scikit-rf/scikit-rf,jhillairet/scikit-rf,temmeand/scikit-rf,temmeand/scikit-rf,temmeand/scikit-rf