Can we allow palette param in resize API?

[vaibsharma]

I saw that in bimg we have palette expose for pngsave_buffer but from imaginary we are not passing that param from API. Is there plan to fix it?
https://github.com/h2non/imaginary/blob/master/options.go#L11

But in bimg we do have a param to allow that palette param
https://github.com/h2non/bimg/blob/master/options.go#L228

[h2non]

Happy to merge a PR with the feature, it is easy to implement 👍

[vaibsharma]

@h2non Done :)