Add changelog entry

Author: pindab0ter

CHANGELOG.md

@@ -5,6 +5,9 @@ All notable changes to this project will be documented in this file.
 [Next release](https://github.com/barryvdh/laravel-ide-helper/compare/v2.12.3...master)
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+### Added
+- Add support for attribute accessors marked as protected. [#1339 / pindab0ter](https://github.com/barryvdh/laravel-ide-helper/pull/1339)
+
 2022-03-06, 2.12.3
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