Use valid Plotly.js CDN

[ndrezn]

The plotly-latest CDN in use in this project is unfortunately deprecated:

plotly_matlab/plotlysetup_offline.m

Line 14 in 7007414

plotly_bundle_url = 'http://cdn.plot.ly/plotly-latest.min.js';

This should be updated to the latest (or at least pinned to a version plotly_matlab supports) -- see e.g. https://plotly.com/javascript/getting-started/

The format looks like: https://cdn.plot.ly/plotly-3.2.0.min.js