remove unused require
remove unused require

olegka311/FirstKnApp,watson-developer-cloud/speech-to-text-nodejs,nothinkelse/sentiment-of-things,olegka311/KnFirstapp,nothinkelse/sentiment-of-things,patrickcho168/EmHacks,leonrch/speech-to-text-nodejs,nothinkelse/sentiment-of-things,kasaby/speech-to-text-nodejs,watson-developer-cloud/speech-to-text-nodejs