remove system_id from vehicle_status

Removes system_id from vehicle_status endpoint

gbfs.md

@@ -642,7 +642,6 @@ Field Name | REQUIRED | Type | Defines
 ---|---|---|---
 `vehicles` | Yes | Array | Array that contains one object per vehicle that is currently stopped as defined below.
 \- `vehicle_id` | Yes | ID | Identifier of a vehicle. The `vehicle_id` identifier MUST be rotated to a random string after each trip to protect user privacy *(as of v2.0)*. Use of persistent vehicle IDs poses a threat to user privacy. The `vehicle_id` identifier SHOULD only be rotated once per trip.
-\-&nbsp;`system_id` <br/>*(added in v3.0-RC)* | Conditionally REQUIRED | ID | Identifier referencing the `system_id` field in [system_information.json](#system_informationjson). REQUIRED in the case of feeds that specify free floating (undocked) vehicles and define systems in [system_information.json](#system_informationjson).
 \-&nbsp;`lat` | Conditionally REQUIRED <br/>*(as of v2.1)* | Latitude | Latitude of the vehicle in decimal degrees. *(as of v2.1)* This field is REQUIRED if `station_id` is not provided for this vehicle (free floating). This field SHOULD have a precision of 6 decimal places (0.000001). See [Coordinate Precision](#coordinate-precision).
 \-&nbsp;`lon` | Conditionally REQUIRED <br/>*(as of v2.1)* | Longitude | Longitude of the vehicle. *(as of v2.1)* This field is REQUIRED if `station_id` is not provided for this vehicle (free floating).
 \-&nbsp;`is_reserved` | Yes | Boolean | Is the vehicle currently reserved? <br /><br /> `true` - Vehicle is currently reserved. <br /> `false` - Vehicle is not currently reserved.