Update CHANGELOG.md

Author: oleibman

CHANGELOG.md

@@ -5,7 +5,32 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com)
 and this project adheres to [Semantic Versioning](https://semver.org).
 
-## 2024-09-29 - 3.0.0
+## TBD - 3.4.0
+
+### Added
+
+- Nothing yet.
+
+### Changed
+
+- Nothing yet.
+
+### Deprecated
+
+- IREADER::SKIP_EMPTY_CELLS - use its alias IGNORE_EMPTY_CELLS instead.
+
+### Moved
+
+- Nothing yet.
+
+### Fixed
+
+- Xls Writer Condtional Rules Applied to Whole Rows or Columns. [Issue #3185](https://github.com/PHPOffice/PhpSpreadsheet/issues/3185) [PR #4152](https://github.com/PHPOffice/PhpSpreadsheet/pull/4152)
+- Xlsx Writer Duplicate ContentTypes Entry for Background Image. [Issue #4179](https://github.com/PHPOffice/PhpSpreadsheet/issues/4179) [PR #4180](https://github.com/PHPOffice/PhpSpreadsheet/pull/4180)
+- Check strictNullComparison outside of loops. [PR #3347](https://github.com/PHPOffice/PhpSpreadsheet/pull/3347)
+- SUMIFS Does Not Require _xlfn. [Issue #4182](https://github.com/PHPOffice/PhpSpreadsheet/issues/4182) [PR #4186](https://github.com/PHPOffice/PhpSpreadsheet/pull/4186)
+
+## 2024-09-29 - 3.3.0 (no 3.0.\*, 3.1.\*, 3.2.\*)
 
 ### Dynamic Arrays