Update CHANGELOG

Author: RomainLvr

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fix SQL warning when no user session is active during plugin init
 - Fix error when submitting a form with an hidden question of type `Field`
 - Fixed a bug where a field was deleted when at least one question in a form was linked to another field