Issue building Motif with Xcode 12

[kunal30xi]

We are currently importing Motif 0.3.8 via Carthage
When building with Xcode 12, there is a compilation error on line 434 and line 436 of UIColor+HTMLColors.m

{
    float f = 0.0;
    if ([self scanFloat:&f]) {
        if ([self scanString:@"%" intoString:NULL]) {
            f *= 0.01;
        } else {
            f *= scale;
        }
        if (value) {
            *value = f;
        }
        return YES;
    }
    return NO;
}

Compilation error: Implicit conversion when assigning computation result loses floating-point precision: 'double' to 'float'

[kunal30xi]

Pull request #102 submitted.

[kunal30xi]

@erichoracek Any chances of getting this PR #102 merged in for this issue?