Fix doc build failed (#280)

Author: jmjoy

Cargo.toml

@@ -11,6 +11,7 @@ categories = ["network-programming"]
 readme = "README.md"
 
 [package.metadata."docs.rs"]
+rustdoc-args = ["--cfg", "docsrs"]
 all-features = true
 
 [workspace]

src/lib.rs

@@ -71,6 +71,8 @@
 //! ```
 //! For more consumer options check [`ConsumerBuilder`]
 
+#![cfg_attr(docsrs, feature(doc_cfg))]
+
 mod byte_capacity;
 mod client;
 mod consumer;