fix: casing of names

lib/src/directions.dart

@@ -161,16 +161,16 @@ class TravelMode {
   static final values = <TravelMode>[bicycling, driving, transit, walking];
 
   /// Specifies a bicycling directions request.
-  static const bicycling = TravelMode('bicycling');
+  static const bicycling = TravelMode('BICYCLING');
 
   /// Specifies a driving directions request.
-  static const driving = TravelMode('driving');
+  static const driving = TravelMode('DRIVING');
 
   /// Specifies a transit directions request.
-  static const transit = TravelMode('transit');
+  static const transit = TravelMode('TRANSIT');
 
   /// Specifies a walking directions request.
-  static const walking = TravelMode('walking');
+  static const walking = TravelMode('WALKING');
 
   @override
   int get hashCode => _name.hashCode;

lib/src/directions.request.dart

@@ -221,7 +221,7 @@ class DirectionsRequest {
   @override
   String toString() => '?origin=${_convertLocation(origin)}&'
       'destination=${_convertLocation(destination)}'
-      '${_addIfNotNull('mode', travelMode)}'
+      '${_addIfNotNull('mode', travelMode?.toString().toLowerCase())}'
       '${_addIfNotNull('waypoints', _convertWaypoints())}'
       '${_addIfNotNull('alternatives', alternatives)}'
       '${_addIfNotNull('avoid', _convertAvoids())}'
@@ -628,23 +628,23 @@ class TransitMode {
 
   /// Indicates that the calculated route should prefer travel
   /// by bus.
-  static const bus = TransitMode('BUS');
+  static const bus = TransitMode('bus');
 
   /// Indicates that the calculated route should prefer travel
   /// by bus.
-  static const subway = TransitMode('SUBWAY');
+  static const subway = TransitMode('subway');
 
   /// Indicates that the calculated route should prefer travel
   /// by bus.
-  static const train = TransitMode('TRAIN');
+  static const train = TransitMode('train');
 
   /// Indicates that the calculated route should prefer travel
   /// by bus.
-  static const tram = TransitMode('TRAM');
+  static const tram = TransitMode('tram');
 
   /// Indicates that the calculated route should prefer travel
   /// by bus.
-  static const rail = TransitMode('RAIL');
+  static const rail = TransitMode('rail');
 
   @override
   String toString() => _name;