Update mobile_scanner.dart

Author: navaronbracke

lib/mobile_scanner.dart

@@ -13,6 +13,7 @@ export 'src/mobile_scanner.dart';
 export 'src/mobile_scanner_controller.dart';
 export 'src/mobile_scanner_exception.dart';
 export 'src/mobile_scanner_platform_interface.dart';
+export 'src/mobile_scanner_view_attributes.dart';
 export 'src/objects/address.dart';
 export 'src/objects/barcode.dart';
 export 'src/objects/barcode_capture.dart';
@@ -32,4 +33,3 @@ export 'src/overlay/barcode_overlay.dart';
 export 'src/overlay/barcode_painter.dart';
 export 'src/overlay/scan_window_overlay.dart';
 export 'src/overlay/scan_window_painter.dart';
-export 'src/mobile_scanner_view_attributes.dart';