Notebook 7 was released over a year ago: https://blog.jupyter.org/announcing-jupyter-notebook-7-8d6d66126dcf and we still release an npm extension to include compatibility for jupyter notebook < 7: https://www.npmjs.com/package/jupyterlab-plotly. We should remove it