Update the changelog

Author: fjarri

CHANGELOG.md

@@ -4,7 +4,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## [Unreleased]
+## [0.3.0] - In development
+
+### Changed
+
+- `sieve_once()` was removed ([#22]).
+- `MillerRabin::new()` and `test_random_base()` will panic if the input is invalid. ([#22])
+
 
 ### Added
 
@@ -14,9 +20,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Some mistakes in the description of Lucas checks (the logic itself was fine). ([#20])
+- Major performance increase across the board due to better sieving (especially for random safe prime finding). ([#22])
 
 
 [#20]: https://github.com/nucypher/rust-umbral/pull/20
+[#22]: https://github.com/nucypher/rust-umbral/pull/22
 
 
 ## [0.2.0] - 2023-03-06
@@ -52,6 +60,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 Initial release.
 
 
-[Unreleased]: https://github.com/entropyxyz/crypto-primes/compare/v0.2.0...HEAD
 [0.1.0]: https://github.com/nucypher/rust-umbral/releases/tag/v0.1.0
 [0.2.0]: https://github.com/nucypher/rust-umbral/releases/tag/v0.2.0