Updates details of a shipment identified by the shipmentId.
This is a partial update, meaning that only the provided fields will be updated,
except when updating segments, the whole segments will be replaced fully.

Changing the status of the shipment affects the statuses of the segments. The following
status changes are allowed:

• pending → ongoing
  • changes the status of the first segment to ongoing
• pending → cancelled
  • changes the status of all segments to cancelled
• ongoing → cancelled
  • cancels the current ongoing segment and all the succeeding segments
• ongoing → completed
  • completes the current ongoing segment and cancels all the succeeding segments

Note:
segments and autoStart can be updated via this API call only if the shipment is in
pending state.

The "Tracker only" variant of the request updates the given tracking device
to all ongoing and pending state segments of the shipment, so it allows
to make tracker association both for ongoing and pending state shipments.