Re-export reqwest crate (#158)

* Re-export reqwest crate

In a large project, it's not unheard of for multiple mutually-incompatible versions of a major crate like `reqwest` to end up in the mix.  By re-exporting the version of `reqwest` used by `reqwest-middleware`, we can be sure we're referring to the *correct* `reqwest`, rather than some other, incompatible, `reqwest`.

* Update CHANGELOG.md

---------

Co-authored-by: Ethan Brierley <[email protected]>

Author: mpalmer

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - Added support for `opentelemetry` version `0.23`.
+- Added re-export of `reqwest`.
 - `http2`, `rustls-tls`, and `charset` features, which simply enable those features in `reqwest`.
 
 ## [0.3.1]

reqwest-middleware/src/lib.rs

@@ -58,3 +58,4 @@ pub use client::{ClientBuilder, ClientWithMiddleware, RequestBuilder};
 pub use error::{Error, Result};
 pub use middleware::{Middleware, Next};
 pub use req_init::{Extension, RequestInitialiser};
+pub use reqwest;