Update app.py

app.py

@@ -6,7 +6,7 @@ from datetime import datetime, timedelta
 import pandas as pd
 import numpy as np
 import yfinance as yf
-import pandas-ta as ta # 新增：技術分析套件
+import pandas_ta as ta # 新增：技術分析套件
 
 # Dash & Plotly
 from dash import Dash, dcc, html, callback