Update changelog

Author: darrenburns

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [0.8.0] - Unreleased
 
-### Fixed 
+### Fixed
 
 - Fixed issues with nested auto dimensions https://github.com/Textualize/textual/issues/1402
 - Fixed watch method incorrectly running on first set when value hasn't changed and init=False https://github.com/Textualize/textual/pull/1367
@@ -20,6 +20,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 
 - Moved Ctrl+C, tab, and shift+tab to App BINDINGS
+- Queries/`walk_children` no longer includes self in results by default https://github.com/Textualize/textual/pull/1416
 
 ## [0.7.0] - 2022-12-17