Update version number to 4.0.0.
Update version number to 4.0.0.

monooso/campaigner.ee_addon,experience/campaigner.ee_addon,monooso/campaigner.ee_addon,experience/campaigner.ee_addon,monooso/campaigner.ee_addon,experience/campaigner.ee_addon,experience/campaigner.ee_addon,monooso/campaigner.ee_addon,experience/campaigner.ee_addon,monooso/campaigner.ee_addon