Gantt Chart, set legend/colorbar at the top of chart

Hi @jmmease ,

I have the same issue as @MQ94, where the legend is right below and needs to scroll down to see it.

At first, I thought that maybe the issue could be how long the yaxis is, and due to a large number of unique tasks. However, sticking to the date string formats similar to the plotly example does not recreate the problem. I’ve tried to do some investigation and I believe the problem could be the use of timestamps rather than date strings.

The plotly example for ff.create_gantt() uses -> Start=β€˜2017-01-01’, Finish=β€˜2017-02-02’
For my case, β€˜Start’: Timestamp(β€˜2018-07-07 00:00:00’), β€˜Finish’: Timestamp(β€˜2019-01-10 00:00:00’), which creates the problem. Datatype was created from pd.to_datetime