Allow passing unparsed response body to error handler

[blackxored]

I've this specific backend that returns 400 but also a payload (i.e body) indicating the errors. Dropping this library into the project prevents me from doing further processing of that body as I would do with native fetch's catch right before parsing. Error handler only seems to be given a message (since respInfo is broken, as you need to add it as a property or make a custom Error class), and even then no response body that I can continue processing on after checking the status code (i.e calling .json() on it).

[wkh237]

@blackxored , thanks for the suggestion. I'll try to fix this bug once I have time 👍

[wkh237]

@blackxored , I've change the error handling on native side, I think it should works as expected now. Please try upgrade to 0.10.0-beta.2 and see if it works propery 😄