Improve fractal image - black area

[TheWindRider]

The last video suggest room for improvement regarding the black area, and I suggest modify the drawFractal() method:

• Put red, green, blue calculations outside of if (iterations != Mandelbrot::MAX_ITERATIONS) blob
• Declare a hue variable outside of that if statement, and set hue equal to (double) totalPixels / rangeTotal within the if statement
• By initializing the hue value (e.g., =1.0), black area, which corresponds to MAX_ITERATIONS, will be other colors