Allow setting of default colors

[olizhu]

This is currently implemented on plotly.js with the colorway attribute in layout but does not work in python. Is there any plan to enable this in python?
The relevant page: plotly/plotly.js#2156

[cldougl]

Hi there,
This was implemented in python: https://plot.ly/python/reference/#layout-colorway
The python api is a wrapper around plotly.js you can check the changelog for plotly.js updates: https://github.com/plotly/plotly.py/blob/master/CHANGELOG.md