Update changelog

Author: object-Object

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and [Pydantic's HISTORY.md](https://github.com/pydantic/pydantic/blob/main/HISTORY.md), and this project *mostly* adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## `1!0.1.0a25`
+
+### Contributions
+
+* Add ru_ru localization for main hexdoc lang, by JustS-js in [#87](https://github.com/hexdoc-dev/hexdoc/pull/87).
+
 ## `1!0.1.0a24`
 
 ### Fixed