GuzzleClient - change body retrieval to rewind stream (#552)
GuzzleClient - change body retrieval to rewind stream (#552)

Logging (or other) middleware may have already read from the Guzzle body - getContents() only returns remaining contents from the stream, we definitely want it all here, so cast to a string (which forces a rewind) - see also: https://stackoverflow.com/a/30549372/86696
twilio/twilio-php