Tests with bearer_auth?

[makorne]

Hi!
Thank you for helpful crate!

It will be great if it contains code for bearer_auth too.
Like axum-auth

[bgrundmann]

More generally speaking I think it would be nice to expose the builder in RequestBuilder that way this library doesn't have to play catch-up with https://docs.rs/reqwest/latest/reqwest/struct.RequestBuilder.html . If you don't want to mark it public directly it could be behind a builder_mut() function (I think -- I'm still pretty new to rust).