add missing changes to CHANGELOG.md

CHANGELOG.md

@@ -14,6 +14,10 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 - [The `ConstraintViolationSet.equals` method](https://akkurate.dev/api/akkurate-core/dev.nesk.akkurate.constraints/-constraint-violation-set/equals.html) is now symmetric and matches [what's in the specification.](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/equals.html)
 
+### Added
+
+- Support Kotlin Multiplatform and all its targets ([#33](https://github.com/nesk/akkurate/issues/33))
+
 ### Changed
 
 - The default violation message of the [`isInstanceOf`](https://akkurate.dev/api/akkurate-core/dev.nesk.akkurate.constraints.builders/is-instance-of.html) and [`isNotInstanceOf`](https://akkurate.dev/api/akkurate-core/dev.nesk.akkurate.constraints.builders/is-not-instance-of.html) constraints now display the simple name of the type, instead of the qualified one.