Add new plot: timeline

[hofes]

Hello,

it would be nice if you could add a similar plot like VisJS to plotly.

Thank you.

Br,
Stephan

[etpinard]

added to #2221

Thanks!

[mounicanaidu]

@hofes I too needed plotly to create timeline view but I couldn't wait and hence created this small workaround till we have one from plotly for simple timelines. Check it out here.