add delete to list resource as well
add delete to list resource as well

supermanheng21/twilio-python,johannakate/twilio-python,twilio/twilio-python,YeelerG/twilio-python,Stackdriver/twilio-python,Stackdriver/twilio-python,Mobii/twilio-python,Rosy-S/twilio-python,tysonholub/twilio-python,bcorwin/twilio-python