Update CHANGELOG

Author: sandervanhooft

CHANGELOG.md

@@ -2,6 +2,14 @@
 
 All notable changes to `sandorian/moneybird-api-php` will be documented in this file.
 
+## v0.2.6 - 2026-01-07
+
+### What's Changed
+
+* Add OpenAPI spec documentation and fix 5 API bugs by @sandervanhooft in https://github.com/sandorian/moneybird-api-php/pull/51
+
+**Full Changelog**: https://github.com/sandorian/moneybird-api-php/compare/v0.2.5...v0.2.6
+
 ## v0.2.5 - 2026-01-07
 
 ### What's Changed
@@ -88,6 +96,7 @@ Feedback and contributions are welcome.
 
 
 
+  
   ```
 
 **Full Changelog**: https://github.com/sandorian/moneybird-api-php/compare/v0.1.1...v0.2.0