------------------
- Hardcode the xml prefix to the xml namespace as defined in the specs (367)
- Fix parsing of unbound sequences within xsd choices (380)
- Use logger.debug() for debug related logging (369)
- Add the ``Client.raw_response`` option to let zeep return the raw
transport response (requests.Response) instead of trying to parse it.
- Handle minOccurs/maxOccurs properlhy for xsd:Group elements. This also
fixes a bug in the xsd:Choice handling for multiple elements (374, 410)
- Fix raising XMLSyntaxError when loading invalid XML (Antanas Sinica, 396)