Export structures

Author: Jupi007

example/main.dart

@@ -2,7 +2,6 @@ import 'dart:io';
 import 'dart:typed_data';
 
 import 'package:libsane/libsane.dart';
-import 'package:libsane/src/structures.dart';
 
 void main(List<String> args) async {
   final sane = LibSaneIsolate(sane: LibSane());

lib/libsane.dart

@@ -3,4 +3,5 @@ library;
 export 'src/exceptions.dart';
 export 'src/libsane.dart';
 export 'src/libsane_isolate.dart';
+export 'src/structures.dart';
 export 'src/utils.dart';

lib/src/libsane_isolate.dart

@@ -2,7 +2,6 @@ import 'dart:isolate';
 import 'dart:typed_data';
 
 import 'package:libsane/libsane.dart';
-import 'package:libsane/src/structures.dart';
 
 class LibSaneIsolate implements LibSane {
   LibSaneIsolate({