Use color_temp_kelvin instead of kelvin for configuring color

[h3llrais3r]

Hi, it seems that the attribute 'kelvin' is deprecated in favor of 'color_temp_kelvin'.
Specifiying a color with 'color_temp_kelvin' does not produce the same color as with 'kelvin':

Since the documentation states that all attributes from light.turn_on are supported, it would be great that color_temp_kelvin would be supported as well.

Thanks for this nice card!