Pass Yup validation errors through `generateMessage` callback

[cristiancalara]

Hey, thanks for the great package!

I'm using Yup for validation. And I want to add localization. While I can set the locale in Yup as the full strings, I would like to take the approach suggested by Yup in its documentation and only return the localization keys https://github.com/jquense/yup#localization-and-i18n

I tried using the generateMessage function, but looking in the code, this is not called for Yup (as it's already stated in the docs). I thought we could pass the messages from Yup through this function as well.

Thanks!

[logaretm]

That is reasonable, I will try to figure something out.