update changelog for v0.3.0

CHANGELOG.md

@@ -5,6 +5,36 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.3.0] (2024-09-21)
+
+### Added
+
+- **API**: function `Flatten` (renamed from `Concat`)
+- **API**: function `Between`
+- **API**: function `Enumerate`
+- **API**: functions `Equal`, `EqualFunc`
+- **API**: functions `Compare`, `CompareFunc`, `IsSorted`, and `IsSortedFunc`
+- **API**: functions `Min`, `MinFunc`, `Max`, and `MaxFunc`
+- **API**: functions `SortedFromMap` and `SortedFuncFromMap`
+
+### Changed
+
+- **API** (breaking change): the type parameter in function `ContainsFunc`
+  is now (correctly) unconstrained.
+- **API** (breaking change): `Concat` previously took an iterator over iterators;
+  it now takes a slice of iterators.
+- **Behavior**: functions `Take` and `Drop` now tolerate a negative `count`
+  argument.
+- **Documentation**: sinks that may not terminate are now documented as such.
+- **Documentation**: various other improvements
+
+### Removed
+
+- **API** (breaking change): function `AllLeafErrors`
+- **API** (breaking change): function `Append`
+- **API** (breaking change): function `FlatMap`
+- **API** (breaking change): functions `Cons`, `Head`, `Tail`, and `Uncons`
+
 ## [0.2.0] (2024-09-16)
 
 ### Added
@@ -32,5 +62,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [0.1.0] (2024-09-14)
 
+[0.3.0]: https://github.com/jub0bs/iterutil/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/jub0bs/iterutil/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/jub0bs/iterutil/releases/tag/v0.1.0