chore: adapt for release of 2.9.1

Author: mfn

CHANGELOG.md

@@ -2,8 +2,11 @@
 
 All notable changes to this project will be documented in this file.
 
-[Next release](https://github.com/barryvdh/laravel-ide-helper/compare/v2.9.1...master)
+[Next release](https://github.com/barryvdh/laravel-ide-helper/compare/v2.9.2...master)
 --------------
+
+2021-03-15, 2.9.1
+-----------------
 ### Added
 - Generate PHPDoc for Laravel 8.x factories [\#1074 / ahmed-aliraqi](https://github.com/barryvdh/laravel-ide-helper/pull/1074)
 - Add a comment to a property like table columns [\#1168 / biiiiiigmonster](https://github.com/barryvdh/laravel-ide-helper/pull/1168)