updated README.md

README.md

@@ -172,7 +172,7 @@ await api.file.upload('C:\\my_file.txt', '/my_file.txt', progress_cb, false, tru
 // Truncate / resize file
 {
   const f = await api.file.create_or_open('/my_file.txt');
-  const b = await f.truncate(10);
+  await f.truncate(10);
   await f.close();
 }
 ```