Update CHANGELOG.md

Author: oleibman

CHANGELOG.md

@@ -36,6 +36,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Ignore ignoredErrors when not applicable. [Issue #4375](https://github.com/PHPOffice/PhpSpreadsheet/issues/4375) [PR #4377](https://github.com/PHPOffice/PhpSpreadsheet/pull/4377)
 - Better handling of defined names on sheets whose titles include apostrophes. [Issue #4356](https://github.com/PHPOffice/PhpSpreadsheet/issues/4356) [Issue #4362](https://github.com/PHPOffice/PhpSpreadsheet/issues/4362) [Issue #4376](https://github.com/PHPOffice/PhpSpreadsheet/issues/4376) [PR #4360](https://github.com/PHPOffice/PhpSpreadsheet/pull/4360)
 - Partial solution for removing rows or columns that include edge ranges. [Issue #1449](https://github.com/PHPOffice/PhpSpreadsheet/issues/1449) [PR #3528](https://github.com/PHPOffice/PhpSpreadsheet/pull/3528)
+- Prefer mb_str_split to str_split. [PR #3341](https://github.com/PHPOffice/PhpSpreadsheet/pull/3341)
 
 ## 2025-02-08 - 4.0.0