fix changelog

Author: willmcgugan

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [0.71.0]
+## [0.71.0] - 2024-06-29
 
 ### Changed
 
@@ -2170,7 +2170,7 @@ https://textual.textualize.io/blog/2022/11/08/version-040/#version-040
 - New handler system for messages that doesn't require inheritance
 - Improved traceback handling
 
-[0.70.1]: https://github.com/Textualize/textual/compare/v0.70.0...v0.71.0
+[0.71.0]: https://github.com/Textualize/textual/compare/v0.70.0...v0.71.0
 [0.70.0]: https://github.com/Textualize/textual/compare/v0.69.0...v0.70.0
 [0.69.0]: https://github.com/Textualize/textual/compare/v0.68.0...v0.69.0
 [0.68.0]: https://github.com/Textualize/textual/compare/v0.67.1...v0.68.0