allowHalfRating - Whether to use whole number for rating(1.0 or 0.5)
onChanged(double rating) - Rating changed callback
count - The maximum amount of stars
value - The current value of rating
size - The size of a single star
color - The body color of star
borderColor - The border color of star
spacing - Spacing between stars(default is 0.0)
filledIcon - Full Rated Icon
halfIcon - Half Rated Icon
defaultIcon - Default Rated Icon