Update app.py

app.py

@@ -5,9 +5,9 @@ Swami's Chatbot Alpha Version
 '''
 
 from langchain.vectorstores import FAISS
-from langchain.chains.question_answering import load_qa_chain
 from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain.llms import OpenAI
+from langchain.chains import RetrievalQA
 from langchain import PromptTemplate
 import gradio as gr
 import time