added notes to changelog about refactoring
added notes to changelog about refactoring

PHLF/rasa_nlu,RasaHQ/rasa_nlu,beeva-fernandocerezal/rasa_nlu,beeva-fernandocerezal/rasa_nlu,PHLF/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu