msrv strikes again

src/lib.rs

@@ -1,10 +1,14 @@
 #![cfg_attr(feature = "nightly", feature(specialization))]
 #![cfg_attr(docsrs, feature(doc_cfg))]
-#![deny(
+#![cfg_attr(
+    docsrs, // rustdoc:: is not supported on msrv
+    deny(
         invalid_doc_attributes,
         rustdoc::broken_intra_doc_links,
         rustdoc::bare_urls
+    )
 )]
+
 //! Rust bindings to the Python interpreter.
 //!
 //! PyO3 can be used to write native Python modules or run Python code and modules from Rust.