Bug hsb with brightness

[GROOVIZ]

The current implementation does not update the brightness of HSB colors:

@override
HsbColor withBrightness(num value) {
  assert(value != null && value >= 0 && value <= 100);

  return HsbColor(hue, saturation, brightness, alpha);
}

I changed it to follow what you did on other withXYZ methods, i.e. shadowing the instance variable:

@override
HsbColor withBrightness(num brightness) {
  assert(brightness!= null && brightness>= 0 && brightness<= 100);

  return HsbColor(hue, saturation, brightness, alpha);
}

A better solution could be to use value for the incoming parameter:

@override
HsbColor withBrightness(num value) {
  assert(value != null && value >= 0 && value <= 100);

  return HsbColor(hue, saturation, value, alpha);
}

[GROOVIZ]

Fix provided in https://github.com/james-alex/flutter_color_models/pull/1