Update CHANGELOG.md

Author: oleibman

CHANGELOG.md

@@ -30,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Fixed
 
 - Micro-optimization for excelToDateTimeObject. [Issue #4438](https://github.com/PHPOffice/PhpSpreadsheet/issues/4438) [PR #4442](https://github.com/PHPOffice/PhpSpreadsheet/pull/4442)
+- Removing Columns/Rows Containing Merged Cells. [Issue #282](https://github.com/PHPOffice/PhpSpreadsheet/issues/282) [PR #4465](https://github.com/PHPOffice/PhpSpreadsheet/pull/4465)
 - Print Area and Row Break. [Issue #1275](https://github.com/PHPOffice/PhpSpreadsheet/issues/1275) [PR #4450](https://github.com/PHPOffice/PhpSpreadsheet/pull/4450)
 - Xls Writer Treat Hyperlink Starting with # as Internal. [Issue #56](https://github.com/PHPOffice/PhpSpreadsheet/issues/56) [PR #4453](https://github.com/PHPOffice/PhpSpreadsheet/pull/4453)