Wrong divisor?

[huntiep]

https://github.com/corona10/goimagehash/blob/d8115886f3603fc5951521bf095d0c1ee73b9b47/transforms/pixels.go#L22 https://github.com/corona10/goimagehash/blob/d8115886f3603fc5951521bf095d0c1ee73b9b47/transforms/pixels.go#L49 I think the divisor for the blue byte should be 257 as well.