Update client to v0.6.4 Compatible with API v0.6.4
Update client to v0.6.4
Compatible with API v0.6.4

- WSDL is now always loaded through API url (by appending ?wsdl to URL).
- ns__Article gets default 'webshop' property if it has not been set through user.

mplus-software/mplus-api-client-php