Add From<T> for Response<T>

[amrhassan]

Hello,

Motivation

I've noticed that there's no From<T> implementation for Response<T> and thought it was worth having for the times when writing t.into() is snappier than Response::new(t).

Solution

I've added the trait impl.

[LucioFranco]

I am trying to remember why we didn't include this. I know for requests we have IntoRequest. But I can't come up with why we shouldn't include this. Would love to hear from others @neoeinstein @davidpdrsn

[LucioFranco]

This is going to have to wait for the next breaking change release.