Update change log

Author: oleibman

docs/changes/2.x/2.0.0.md

@@ -10,6 +10,8 @@
 
 - bug: TemplateProcessor fix multiline values [@gimler](https://github.com/gimler) fixing [#268](https://github.com/PHPOffice/PHPWord/issues/268), [#2323](https://github.com/PHPOffice/PHPWord/issues/2323) and [#2486](https://github.com/PHPOffice/PHPWord/issues/2486) in [#2522](https://github.com/PHPOffice/PHPWord/pull/2522)
 
+- 32-bit Problem in PasswordEncoder [@oleibman](https://github.com/oleibman) fixing [#2550](https://github.com/PHPOffice/PHPWord/issues/2550) in [#2551](https://github.com/PHPOffice/PHPWord/pull/2551)
+
 ### Miscellaneous
 
 - Bump dompdf/dompdf from 2.0.3 to 2.0.4 by [@dependabot](https://github.com/dependabot) in [#2530](https://github.com/PHPOffice/PHPWord/pull/2530)