Merge pull request #21 from thc202/update-changelog

Prepare next dev version

Author: kingthorin

CHANGELOG.md

@@ -4,6 +4,8 @@ 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]
+
 ## [0.3.1] - 2023-07-05
 ### Fixed
 - Check issues with authenticated user. [#19](https://github.com/zaproxy/action-api-scan/issues/19)
@@ -28,6 +30,7 @@ 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-api-scan/compare/v0.3.1...HEAD
 [0.3.1]: https://github.com/zaproxy/action-api-scan/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/zaproxy/action-api-scan/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/zaproxy/action-api-scan/compare/v0.1.1...v0.2.0