bugfix: off-by-one error on char slicing for putting entities in MITIE
bugfix: off-by-one error on char slicing for putting entities in MITIE

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