Update README.md

"filepath" attribute does not exist for each example.
"filename" attribute should be "file_name".

README.md

@@ -93,7 +93,7 @@ PATH_TO_IMAGE_FOLDER = "COCO2017"
 
 def create_full_path(example):
     """Create full path to image using `base_path` to COCO2017 folder."""
-    example["image_path"] = os.path.join(PATH_TO_IMAGE_FOLDER, example["filepath"], example["filename"])
+    example["image_path"] = os.path.join(PATH_TO_IMAGE_FOLDER, example["file_name"])
     return example
 
 dataset = load_dataset("phiyodr/coco2017")