Show features behind feature flags in docs

Signed-off-by: Tomasz Pietrek <[email protected]>

async-nats/Cargo.toml

@@ -63,3 +63,7 @@ compatibility_tests = []
 name = "main"
 harness = false
 lto = true
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]

async-nats/src/lib.rs

@@ -118,6 +118,7 @@
 #![deny(rustdoc::private_intra_doc_links)]
 #![deny(rustdoc::invalid_codeblock_attributes)]
 #![deny(rustdoc::invalid_rust_codeblocks)]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 use thiserror::Error;