feat(error): add `Error::message` (#2737)
feat(error): add `Error::message` (#2737)

This adds Error::message which returns the message that is unique to the error, without the message from the source. That way users can create a newtype around hyper::Error and use this in the Display impl to work around #2732.

Closes #2732
hyperium/hyper,tshepang/hyper,hyperium/hyper,tshepang/hyper,hyperium/hyper,tshepang/hyper