Makes eco_labels plural in vehicle_types (#559)

* Makes eco_labels plural in vehicle_types

gbfs.md

@@ -520,9 +520,9 @@ Field Name | REQUIRED | Type | Defines
 \- `cargo_volume_capacity`<br/>*(added in v2.3)* | OPTIONAL | Non-negative integer | Cargo volume available in the vehicle, expressed in liters. For cars, it corresponds to the space between the boot floor, including the storage under the hatch, to the rear shelf in the trunk.
 \- `cargo_load_capacity`<br/>*(added in v2.3)* | OPTIONAL | Non-negative integer | The capacity of the vehicle cargo space (excluding passengers), expressed in kilograms.
 \- `propulsion_type` | Yes | Enum | The primary propulsion type of the vehicle. <br /><br />Current valid values are:<br /><ul><li>`human` _(Pedal or foot propulsion)_</li><li>`electric_assist` _(Provides electric motor assist only in combination with human propulsion - no throttle mode)_</li><li>`electric` _(Powered by battery-powered electric motor with throttle mode)_</li><li>`combustion` _(Powered by gasoline combustion engine)_</li><li>`combustion_diesel` _(Powered by diesel combustion engine, added in v2.3)_</li><li>`hybrid` _(Powered by combined combustion engine and battery-powered motor, added in v2.3)_</li><li>`plug_in_hybrid` _(Powered by combined combustion engine and battery-powered motor with plug-in charging, added in v2.3)_</li><li>`hydrogen_fuel_cell` _(Powered by hydrogen fuel cell powered electric motor, added in v2.3)_</li></ul> This field was inspired by, but differs from the propulsion types field described in the [Open Mobility Foundation Mobility Data Specification](https://github.com/openmobilityfoundation/mobility-data-specification/blob/main/general-information.md#propulsion-types).
-\- `eco_label`<br/>*(added in v2.3)* | OPTIONAL | Array | Vehicle air quality certificate. Official anti-pollution certificate, based on the information on the vehicle's registration certificate, attesting to its level of pollutant emissions based on a defined standard. In Europe, for example, it is the European emission standard. The aim of this measure is to encourage the use of the least polluting vehicles by allowing them to drive during pollution peaks or in low emission zones.<br /><br />Each element in the array is an object with the keys below.
-&emsp;\-&nbsp; `country_code`<br/>*(added in v2.3)*| Conditionally REQUIRED | Country code | REQUIRED if `eco_label` is defined. Country where the `eco_sticker` applies.
-&emsp;\-&nbsp; `eco_sticker`<br/>*(added in v2.3)* | Conditionally REQUIRED | String | REQUIRED if `eco_label` is defined. Name of the eco label. The name must be written in lowercase, separated by an underscore.<br /><br />Example of `eco_sticker` in Europe :<ul><li>CritAirLabel (France) <ul><li>critair</li><li>critair_1</li><li>critair_2</li><li>critair_3</li><li>critair_4</li><li>critair_5</li></ul></li><li>UmweltPlakette (Germany)<ul><li>euro_2</li><li>euro_3</li><li>euro_4</li><li>euro_5</li><li>euro_6</li><li>euro_6_temp</li><li>euro_E</li></ul></li><li>UmweltPickerl (Austria)<ul><li>euro_1</li><li>euro_2</li><li>euro_3</li><li>euro_4</li><li>euro_5</li></ul><li>Reg_certificates (Belgium)<ul><li>reg_certificates</li></ul><li>Distintivo_ambiental (Spain)<ul><li>0</li><li>eco</li><li>b</li><li>c</li></ul></li></ul>
+\- `eco_labels`<br/>*(as of v3.0-RC2)* | OPTIONAL | Array | Vehicle air quality certificate. Official anti-pollution certificate, based on the information on the vehicle's registration certificate, attesting to its level of pollutant emissions based on a defined standard. In Europe, for example, it is the European emission standard. The aim of this measure is to encourage the use of the least polluting vehicles by allowing them to drive during pollution peaks or in low emission zones.<br /><br />Each element in the array is an object with the keys below.
+&emsp;\-&nbsp; `country_code`<br/>*(added in v2.3)*| Conditionally REQUIRED | Country code | REQUIRED if `eco_labels` is defined. Country where the `eco_sticker` applies.
+&emsp;\-&nbsp; `eco_sticker`<br/>*(added in v2.3)* | Conditionally REQUIRED | String | REQUIRED if `eco_labels` is defined. Name of the eco label. The name must be written in lowercase, separated by an underscore.<br /><br />Example of `eco_sticker` in Europe :<ul><li>CritAirLabel (France) <ul><li>critair</li><li>critair_1</li><li>critair_2</li><li>critair_3</li><li>critair_4</li><li>critair_5</li></ul></li><li>UmweltPlakette (Germany)<ul><li>euro_2</li><li>euro_3</li><li>euro_4</li><li>euro_5</li><li>euro_6</li><li>euro_6_temp</li><li>euro_E</li></ul></li><li>UmweltPickerl (Austria)<ul><li>euro_1</li><li>euro_2</li><li>euro_3</li><li>euro_4</li><li>euro_5</li></ul><li>Reg_certificates (Belgium)<ul><li>reg_certificates</li></ul><li>Distintivo_ambiental (Spain)<ul><li>0</li><li>eco</li><li>b</li><li>c</li></ul></li></ul>
 \- `max_range_meters` | Conditionally REQUIRED | Non-negative float | If the vehicle has a motor (as indicated by having a value other than `human` in the `propulsion_type` field), this field is REQUIRED. This represents the furthest distance in meters that the vehicle can travel without recharging or refueling when it has the maximum amount of energy potential (for example, a full battery or full tank of gas).
 \- `name` <br/>*(as of v3.0-RC)* | OPTIONAL | Array&lt;Localized String&gt; | The public name of this vehicle type.
 \- `vehicle_accessories`<br/>*(added in v2.3)* | OPTIONAL | Array | Description of accessories available in the vehicle.  These accessories are part of the vehicle and are not supposed to change frequently. Current valid values are:<ul><li>`air_conditioning` _(Vehicle has air conditioning)_</li><li>`automatic` _(Automatic gear switch)_</li><li>`manual` _(Manual gear switch)_</li><li>`convertible` _(Vehicle is convertible)_</li><li>`cruise_control` _(Vehicle has a cruise control system ("Tempomat"))_</li><li>`doors_2` _(Vehicle has 2 doors)_</li><li>`doors_3` _(Vehicle has 3 doors)_</li><li>`doors_4` _(Vehicle has 4 doors)_</li><li>`doors_5` _(Vehicle has 5 doors)_</li><li>`navigation` _(Vehicle has a built-in navigation system)_</li></ul>
@@ -638,7 +638,7 @@ Field Name | REQUIRED | Type | Defines
         "rider_capacity": 5,
         "cargo_volume_capacity": 200,
         "propulsion_type": "combustion_diesel",
-        "eco_label": [
+        "eco_labels": [
           {
             "country_code": "FR",
             "eco_sticker": "critair_1"