Prepare next dev version

Add unreleased entry to changelog.

Signed-off-by: thc202 <thc202@gmail.com>

Author: thc202

CHANGELOG.md

@@ -3,6 +3,8 @@ All notable changes to this GitHub action will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+
 ## [0.10.0] - 2023-10-31
 ### Added
 - Support for authentication environment variables.
@@ -78,6 +80,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 First release to Marketplace.
 
+[Unreleased]: https://github.com/zaproxy/action-baseline/compare/v0.10.0...HEAD
 [0.10.0]: https://github.com/zaproxy/action-baseline/compare/v0.9.0...v0.10.0
 [0.9.0]: https://github.com/zaproxy/action-baseline/compare/v0.8.2...v0.9.0
 [0.8.2]: https://github.com/zaproxy/action-baseline/compare/v0.8.1...v0.8.2