Update app.py

app.py

@@ -56,6 +56,7 @@ import asyncio
 import uvicorn
 from fastapi import FastAPI, Request, HTTPException
 from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
+from fastapi.staticfiles import StaticFiles
 
 import nest_asyncio
 from twilio.twiml.messaging_response import MessagingResponse