do not deny the missing docs

src/lib.rs

@@ -4,7 +4,7 @@
 #![deny(trivial_numeric_casts, private_in_public, variant_size_differences)]
 #![deny(stable_features, unreachable_pub, non_shorthand_field_patterns)]
 #![deny(unused_attributes, unused_mut)]
-#![deny(missing_docs)]
+#![warn(missing_docs)]
 #![deny(unused_imports)]
 #![deny(renamed_and_removed_lints, stable_features, unused_allocation)]
 #![deny(unused_comparisons, bare_trait_objects, unused_must_use)]