v0.13.0

• Update rustls and webpki-roots dependencies @adamreichold #57
• Fix clippy warnings and add clippy to CI @adamreichold #57
• Add the Response::error_for_status method @adamreichold #58
• Add the Body trait to permit users to implement sending a body on any object #59
• Add the inspect() method on the RequestBuilder trait to inspect the data contained in the fields @adamreichold #61, see #60 for use cases
• Add support for chunked request bodies @adamreichold #62
• Add a method for streaming a JSON body in the request @adamreichold #65