Update app.py

app.py

@@ -7,6 +7,7 @@ from langchain.chains import ConversationalRetrievalChain
 import time
 import streamlit as st
 import os
+import subprocess
 from langchain.chat_models import ChatOpenAI
 st.set_page_config(page_title="MBAL CHATBOT")
 col1, col2, col3 = st.columns([1,2,1])