Add doc_auto_cfg feature

Author: ventaquil

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Added async support for Tokio runtime.
+- Added `doc_auto_cfg` feature.
 
 ### Fixed
 

src/lib.rs

@@ -39,6 +39,7 @@
 //!
 //! This crate is licensed under the MIT License.
 
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 #![forbid(unsafe_code)]
 
 mod error;