- Bump twilio requirement to latest 6.19.1 version
- The generic response type is gone in the latest
versions of the twilio package. It appears we were
generating an empty response just to get the empty
xml body. TwilML is the new base class all responses
inherit from. So I've switched the code over to using
and empty TwilML object instead.
- The exception type was moved to a different location.