Fix RGB to HSV converter

[Remiii]

Fix RGB to HSV converter.

Round saturation and value is a mistake because value is between 0 to 1 and the numbers after the comma are important.

Error exemple with pink color:

Color pink => #FFC0CB => R: 255, G: 203, B: 192 => H: 350°, S: 0, V: 1

=> Saturation is set to 0 due to the Math.round... the good value is 0,25 for 25% of saturation.

And the good result must be:

Color pink => #FFC0CB => R: 255, G: 203, B: 192 => H: 350°, S: 0.25, V: 1

[Remiii]

Do you have the same issue? Could you give me a feeback?