• #703: PropPatch in client is not correctly encoded.
• #709: Throw exception when running into empty
  supported-calendar-component-set.
• #711: Don't trigger deserializers for empty elements in {DAV:}prop. This
  fixes issues when using sabre/dav as a client.
• #705: A MOVE request that gets prevented from deleting the source resource
  will still remove the target resource. Now all events are triggered before
  any destructive operations.
• The zip release ships with sabre/vobject 3.4.7,
  sabre/http 4.1.0, sabre/event 2.0.2,
  sabre/uri 1.0.1 and sabre/xml 1.2.0.