fix: Export access_rights so Registry.openPath can be called with des…

…iredAccessRights (#26)

lib/win32_registry.dart

@@ -9,6 +9,7 @@
 /// components.
 library;
 
+export 'src/access_rights.dart';
 export 'src/registry.dart';
 export 'src/registry_hive.dart';
 export 'src/registry_key.dart';