Update io.dart

lib/io.dart

@@ -12,7 +12,7 @@ extension MinioX on Minio {
     String bucket,
     String object,
     String filePath, 
-    {void Function(int)? onProgress,},
+    void Function(int)? onProgress,
     [Map<String, String>? metadata,]) async {
     MinioInvalidBucketNameError.check(bucket);
     MinioInvalidObjectNameError.check(object);