Remove unused import

chart.py

@@ -1,6 +1,6 @@
 from iqfeed import get_historical_data, minutes
 from dash import Dash, dcc, html, Input, Output
-from datetime import date, datetime, timedelta
+from datetime import date, datetime
 from dotenv import load_dotenv
 from pandas import Series
 from plotting import CandlestickChart, figure_with_subplots