fix return type of the [_extract_ner] function

README.md

@@ -78,7 +78,7 @@ from transformers import AutoTokenizer, AutoModelForTokenClassification, pipelin
 transformers_logger = logging.getLogger("transformers")
 transformers_logger.setLevel(logging.WARNING)
 
-def _extract_ner(sent: str, ner: pipeline) -> str:
+def _extract_ner(sent: str, ner: pipeline) -> list:
     grouped_ents = []
     current_ent = {}