Update amap_flutter_map.dart

lib/amap_flutter_map.dart

@@ -14,6 +14,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
 export 'package:amap_flutter_map/src/types/types.dart';
+export 'package:amap_flutter_base/amap_flutter_base.dart';
 
 part 'src/amap_controller.dart';
 part 'src/amap_widget.dart';