Remove feature(hashmap_public_hasher)

dtolnay · dtolnay · commit cb4b2c9927d6 · 2016-04-22T11:16:08.000-07:00
This was stabilized in rust-lang/rust#32804
diff --git a/src/lib.rs b/src/lib.rs
@@ -28,7 +28,6 @@
 //! ```
 
 #![forbid(missing_docs)]
-#![cfg_attr(feature = "nightly", feature(hashmap_public_hasher))]
 #![cfg_attr(all(feature = "nightly", test), feature(test))]
 
 // Optional Serde support
