Add gradient to charts.

[hifall]

Adding gradient to charts would add a touch of 'modernness' to the already great looking charts.

See here: https://blog.vanila.io/chart-js-tutorial-how-to-make-gradient-line-chart-af145e5c92f9

[woothu]

Thank you for the idea, we will consider it!

BTW. It is doable already because we expose Chart.js API in our components. Also, widgets have a gradient background already in the PRO version.