Update app.py

app.py

@@ -301,7 +301,7 @@ else:
             auth_token = os.environ["auth_token"]
             client = Client(account_sid, auth_token)
 
-            for i in range len(shelters):
+            for i in range(len(shelters)):
                 message_body.append(f'''
                     {shelters[i]['Organization Name']}: {shelters[i]['Program Name']}
                     🕒 Open Hours: {shelters[i]['Open Hours']}