Update CHANGELOG.md

Author: oleibman

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Changed
 
-- Nothing
+- On read, Xlsx Reader had been breaking up union ranges into separate individual ranges. It will now try to preserve range as it was read in. [PR #4042](https://github.com/PHPOffice/PhpSpreadsheet/pull/4042)
 
 ### Deprecated
 
@@ -29,6 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - POWER Null/Bool Args. [PR #4031](https://github.com/PHPOffice/PhpSpreadsheet/pull/4031)
 - Do Not Output Alignment and Protection for Conditional Format. [Issue #4025](https://github.com/PHPOffice/PhpSpreadsheet/issues/4025) [PR #4027](https://github.com/PHPOffice/PhpSpreadsheet/pull/4027)
 - Xls Conditional Format Improvements. [PR #4030](https://github.com/PHPOffice/PhpSpreadsheet/pull/4030) [PR #4033](https://github.com/PHPOffice/PhpSpreadsheet/pull/4033)
+- Conditional Range Unions and Intersections [Issue #4039](https://github.com/PHPOffice/PhpSpreadsheet/issues/4039) [PR #4042](https://github.com/PHPOffice/PhpSpreadsheet/pull/4042)
 - Csv Reader allow use of html mimetype. [Issue #4036](https://github.com/PHPOffice/PhpSpreadsheet/issues/4036) [PR #4049](https://github.com/PHPOffice/PhpSpreadsheet/pull/4040)
 
 ## 2024-05-11 - 2.1.0