add note about where to find benchmark results
//!
//! ## Benchmarks
//!
-//! To run the benchmarks (using the "criterion" crate), go to the root of a crate and run `cargo bench`.
+//! To run the benchmarks (using the "criterion" crate), go to the root of a crate and run `cargo bench`. As of version 0.5.0,
+//! all benchmark results are posted in the release notes.
//!
//! # Configuration
//!
