Add custom data to token

[hiniesta]

Thanks very much for your work!
I would like to add more data to the token, such as userId. I have follow https://github.com/lexik/LexikJWTAuthenticationBundle/blob/master/Resources/doc/2-data-customization.md and add in config.yml:

services:
uaw_rest.event.jwt_created_listener:
class: UAW\Bundle\RestBundle\EventListener\JWTCreatedListener
tags:
- { name: kernel.event_listener, event: lexik_jwt_authentication.on_jwt_created, method: onJWTCreated }

but class JWTCreatedListener.php is not executed. Any idea?

Thanks!