update changelog

Author: asmello

CHANGELOG.md

@@ -5,6 +5,23 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+-   `EncodingError` and `ParseIndexError` now implement `Diagnostic`, which
+    unifies the API for errors originating from parse-like operations.
+-   Fixes returning an incorrect error type when parsing a `Token` that
+    terminates with `~`. This now correctly classifies the error as a `Tilde`
+    error.
+
+### Removed
+
+-   Some methods were removed from `InvalidCharacterError`, as that type no
+    longer holds a copy of the input string internally. This is a breaking
+    change. To access equivalent functionality, use the `Diagnostic` API
+    integration.
+
 ## [0.7.1] 2025-02-16
 
 ### Changed