Update script headers (#4163)

* Update download script headers

* cleanup

* bug fix attempt

* bug fix attempt2

* bug fix attempt3

* cleanup

utils/datasets.py

@@ -909,7 +909,7 @@ def dataset_stats(path='coco128.yaml', autodownload=False, verbose=False):
             return False, None, path
 
     zipped, data_dir, yaml_path = unzip(Path(path))
-    with open(check_file(yaml_path)) as f:
+    with open(check_file(yaml_path), encoding='ascii', errors='ignore') as f:
         data = yaml.safe_load(f)  # data dict
         if zipped:
             data['path'] = data_dir  # TODO: should this be dir.resolve()?