Merge pull request #32 from lucasnsa/fix/typed_data_import

fix: add typed_data import

lib/src/logic/zxing.dart

@@ -1,6 +1,7 @@
 import 'dart:ffi';
 import 'dart:io';
 import 'dart:isolate';
+import 'dart:typed_data';
 
 import 'package:camera/camera.dart';
 import 'package:ffi/ffi.dart';