Add changelog entry for rich-exception traceback changes

CHANGELOG.md

@@ -5,6 +5,12 @@ 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
+
+### Added
+
+- Exception objects that are `RichRenderable` are rendered, instead of using the class name and string representation https://github.com/Textualize/rich/pull/3325
+
 ## [13.7.1] - 2023-02-28
 
 ### Fixed
@@ -69,7 +75,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Text.tab_size now defaults to `None` to indicate that Console.tab_size should be used.
 
-
 ## [13.4.2] - 2023-06-12
 
 ### Changed
@@ -145,7 +150,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added `encoding` parameter in `Theme.read`
 
-
 ## [13.2.0] - 2023-01-19
 
 ### Changed
@@ -196,7 +200,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add type annotation for key_separator of pretty.Node https://github.com/Textualize/rich/issues/2625
 
-
 ## [12.6.0] - 2022-10-02
 
 ### Added
@@ -216,7 +219,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix missing `mode` property on file wrapper breaking uploads via `requests` https://github.com/Textualize/rich/pull/2495
 - Fix mismatching default value of parameter `ensure_ascii` https://github.com/Textualize/rich/pull/2538
 - Remove unused height parameter in `Layout` class https://github.com/Textualize/rich/pull/2540
-- Fixed exception in Syntax.__rich_measure__ for empty files
+- Fixed exception in Syntax.**rich_measure** for empty files
 
 ### Changed