Update rasa/core/channels/twilio_voice.py
Update rasa/core/channels/twilio_voice.py

Co-authored-by: Tobias Wochinger <5ab5657415213e16a8561b9cb7fb27e3a8c539ed@rasa.com>
RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu