chore: add changelog

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

CHANGELOG.md

-# [1.1.0] - 2023-11-20
+# [1.1.1] - 2024-09-11
+## Changed
+- Update WooCommerce stubs library.
 
+# [1.1.0] - 2023-11-20
 ## Added
 - Included most of PHPStan's strict rules in configuration.
 
 # [1.0.0] - 2023-11-17
-
 ## Added
 - Initial project release with basic configuration.