Add implementation of Debug trait for RequestBuilder. (#50)

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- Implementation of `Debug` trait for `RequestBuilder`.
+
 ## [0.1.5] - 2022-02-21
 
 ### Added

reqwest-middleware/src/client.rs

@@ -260,3 +260,12 @@ impl RequestBuilder {
             .map(|inner| RequestBuilder { inner, client })
     }
 }
+
+impl fmt::Debug for RequestBuilder {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // skipping middleware_stack field for now
+        f.debug_struct("RequestBuilder")
+            .field("inner", &self.inner)
+            .finish_non_exhaustive()
+    }
+}