deactivate parallel test execution on travis (bc slower than sequential...)
deactivate parallel test execution on travis (bc slower than sequential...)

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