make code python3.7 compatible

app.py

@@ -1,7 +1,7 @@
 import copy
 import enum
 import os
-from typing import Optional
+from typing import List, Optional
 
 import requests
 import streamlit as st
@@ -41,7 +41,7 @@ def get_predictions(barcode: str, model_name: str, threshold: Optional[float] =
 
 def display_predictions(
     barcode: str,
-    model_names: list[str],
+    model_names: List[str],
     threshold: Optional[float] = None,
 ):
     debug_showed = False