Update app.py

app.py

@@ -1,6 +1,6 @@
 import streamlit as st
 from transformers import AutoTokenizer
-from llm_engine import HuggingFaceEndpoint, ChatHuggingFace
+from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint
 from huggingface_hub import login
 from PyPDF2 import PdfReader
 from docx import Document