BUG : Hex color to HSL

[ElRochito]

Hi everyone,

For example, if I convert #a8a8a8 hex color to Hsl, I do :

Hex::fromString("#a8a8a8")->toHsl()

I've got an error on Spatie\Color::class when delta is zero.

red, blue and green have same value (0.65882352941176) so $cmin and $cmax have same value

I think is the strict type on

if ($delta !== 0) {

[freekmurze]

We'd accept a PR with tests that fixes this

[ElRochito]

See #38 :)

[freekmurze]

Thanks, we'll continue this in the PR