Update main.py

main.py

@@ -1,7 +1,13 @@
 from fastapi import FastAPI, Request, BackgroundTasks, Header
-from linebot import LineBotApi, WebhookHandler
-from linebot.exceptions import InvalidSignatureError
-from linebot.models import MessageEvent, TextMessage
+from linebot import (
+    LineBotApi, WebhookHandler
+)
+from linebot.exceptions import (
+    InvalidSignatureError
+)
+from linebot.models import (
+    MessageEvent, TextMessage, TextSendMessage, ImageSendMessage, AudioMessage
+)
 from starlette.exceptions import HTTPException
 import os