fix

Author: Chris Yang

packages/google_maps_flutter/google_maps_flutter/ios/Classes/FLTGoogleMapsPlugin.h

@@ -3,6 +3,12 @@
 // found in the LICENSE file.
 
 #import <Flutter/Flutter.h>
+#import <GoogleMaps/GoogleMaps.h>
+#import "GoogleMapCircleController.h"
+#import "GoogleMapController.h"
+#import "GoogleMapMarkerController.h"
+#import "GoogleMapPolygonController.h"
+#import "GoogleMapPolylineController.h"
 
 NS_ASSUME_NONNULL_BEGIN