Update color.lua #2
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Inside 'rgbToHsl', the variable 's' was mistakenly re-declared as local inside the if/then/else block. This caused the function to return saturation either as '0' (for b/w rgb values) or as 'nil' (for all the other cases).
The statement (line 26) was commented, but it can be permanently removed.
I propose to do so and merge the branch with the master one.