Update CHANGELOG.md

Author: oleibman

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Added
 
 - Default Style Alignment Property (workaround for bug in non-Excel spreadsheet apps) [Issue #3918](https://github.com/PHPOffice/PhpSpreadsheet/issues/3918) [PR #3924](https://github.com/PHPOffice/PhpSpreadsheet/pull/3924)
+- Additional Support for Date/Time Styles [PR #3939](https://github.com/PHPOffice/PhpSpreadsheet/pull/3939)
 
 ### Changed
 
@@ -33,6 +34,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Incorrect SUMPRODUCT Calculation [Issue #3909](https://github.com/PHPOffice/PhpSpreadsheet/issues/3909) [PR #3916](https://github.com/PHPOffice/PhpSpreadsheet/pull/3916)
 - Formula Misidentifying Text as Cell After Insertion/Deletion [Issue #3907](https://github.com/PHPOffice/PhpSpreadsheet/issues/3907) [PR #3915](https://github.com/PHPOffice/PhpSpreadsheet/pull/3915)
 - Unexpected Absolute Address in Xlsx Rels [Issue #3730](https://github.com/PHPOffice/PhpSpreadsheet/issues/3730) [PR #3923](https://github.com/PHPOffice/PhpSpreadsheet/pull/3923)
+- Unallocated Cells Affected by Column/Row Insert/Delete [Issue #3933](https://github.com/PHPOffice/PhpSpreadsheet/issues/3933) [PR #3940](https://github.com/PHPOffice/PhpSpreadsheet/pull/3940)
 
 ## 2.0.0 - 2024-01-04