docs: complete Java 2.0.0 changelog

Author: javorosas

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](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [2.0.0] - 2026-08-21
+## [2.0.0] - 2026-08-24
 
 ### Added
 
@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Change `FacturapiException.getErrorCode()` to return strings, including converted legacy numeric codes.
+- Change `InvoiceItem.property_tax_account` to a list of property tax account numbers.
 
 ## [1.3.0] - 2026-06-07