Update the changelog

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added separate entry points for Webpack and Node.JS in the WASM bindings, and added examples for both of these scenarios ([#60])
 - `SecretBox` struct, a wrapper making operations with secret data explicit and ensuring zeroization on drop ([#53])
+- Added benchmarks for the main usage scenario and a feature `bench-internals` to expose some internals for benchmarking ([#54])
 
 
 ### Fixed
@@ -26,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 
 [#53]: https://github.com/nucypher/rust-umbral/pull/53
+[#54]: https://github.com/nucypher/rust-umbral/pull/54
 [#56]: https://github.com/nucypher/rust-umbral/pull/56
 [#60]: https://github.com/nucypher/rust-umbral/pull/60