How would the following, 3.4.x code, translate to master:
```lua
cpugraph = awful.widget.graph()
-- these five lines are usable as it is
cpugraph:set_width(45)
cpugraph:set_height(14)
cpugraph:set_background_color(beautiful.fg_off_widget)
cpugraph:set_color(beautiful.fg_end_widget)
-- but what about gradients ??
cpugraph:set_gradient_angle(0)
cpugraph:set_gradient_colors({ beautiful.fg_end_widget,
beautiful.fg_center_widget, beautiful.fg_widget
})
```
I looked into gears.color, but I am unable to make much sense of it.
--
Anurag Priyam
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