For testing with ipywidgets >= 5.1

For a development installation (requires npm if you want to update js files)

$ git clone https://github.com/hainm/test_nglview_ipywidget5
$ cd test_nglview_ipywidget5
$ python setup.py install

If you want to update ./js/ folder, make sure to add --npm

$ python setup.py install --npm

    jupyter notebook demo.ipynb