Merge pull request #297 from remix/ryanf/clarify-associated-trip-field

Explicitly allow `associated_trip` for any event type

Author: hunterowens

provider/README.md

@@ -276,7 +276,7 @@ Schema: [`status_changes` schema][sc-schema]
 | `event_time` | [timestamp][ts] | Required | Date/time that event occurred, based on device clock |
 | `event_location` | GeoJSON [Point Feature][geo] | Required | |
 | `battery_pct` | Float | Required if Applicable | Percent battery charge of device, expressed between 0 and 1 |
-| `associated_trip` | UUID | Required if Applicable | Trip UUID (foreign key to Trips API) required if `event_type_reason` is `user_pick_up` or `user_drop_off` |
+| `associated_trip` | UUID | Required if Applicable | Trip UUID (foreign key to Trips API), required if `event_type_reason` is `user_pick_up` or `user_drop_off`, or for any other status change event that marks the end of a trip. |
 
 ### Status Changes Query Parameters