Update changelog

Author: sforward

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/v2.12.2...master)
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+### Added
+- Add support for custom casts that implement `CastsInboundAttributes` [#1329 / sforward](https://github.com/barryvdh/laravel-ide-helper/pull/1329)
+
 ### Fixed
 - Fix date and datetime handling for attributes that set a serialization format option for the Carbon instance [#1324 / FLeudts](https://github.com/barryvdh/laravel-ide-helper/pull/1324)