[fuel-jackson] Add Request.body(any: Any) extension method

I’d like to be able to make requests like this:

 val (request, response, result) = Fuel.post(url)
            .body(MyCustomRequestBodyObject(...)) // here
            .responseObject<MyCustomResponseBodyObject>()

Currently I have an extension method in my project which allows this:

fun Request.body(any: Any) = body(mapper...)

Would be nice if this was a part of the fuel-jackson module.

[panpanini]

I can take a look at this if people are busy 🙋

[SleeplessByte]

No, @kittinunf and I both run IntelliJ (NO Android Studio).