Update CHANGELOG.md

Author: cvergne

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to the "php-getters-setters" extension will be documented in this file.
 
 ## [Unreleased]
-- Improve getterName for bool props
+- Improve getterName for bool props — #9
 
 ## [1.3.0] - 2021-01-08
 - Fix vscode compatibility (https://github.com/phproberto/vscode-php-getters-setters/pull/23)