Prepare Change Log for next release

Author: MarkBaker

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## 1.27.1 - 2023-02-08
+## Unreleased - TBD
 
 ### Added
 
@@ -25,7 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
-- Fix Composer --dev dependency issue with dealerdirect/phpcodesniffer-composer-installer renaming their `master` branch to `main`
+- Nothing
 
 
 ## 1.28.0 - 2023-02-25
@@ -64,6 +64,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Conditional Formatting Improvements for Xlsx [Issue #3370](https://github.com/PHPOffice/PhpSpreadsheet/issues/3370) [Issue #3202](https://github.com/PHPOffice/PhpSpreadsheet/issues/3302) [PR #3372](https://github.com/PHPOffice/PhpSpreadsheet/pull/3372)
 - Coerce Bool to Int for Mathematical Operations on Arrays [Issue #3389](https://github.com/PHPOffice/PhpSpreadsheet/issues/3389) [Issue #3396](https://github.com/PHPOffice/PhpSpreadsheet/issues/3396) [PR #3392](https://github.com/PHPOffice/PhpSpreadsheet/pull/3392)
 
+
 ## 1.27.1 - 2023-02-08
 
 ### Added