Update app.py

app.py

@@ -1,7 +1,7 @@
 from langchain.prompts.prompt import PromptTemplate
 from langchain.llms import OpenAI
 from langchain.chains import ChatVectorDBChain
-from langchain.embeddings import HuggingFaceEmbeddings
+from langchain.embeddings import HuggingFaceEmbeddings, HuggingFaceInstructEmbeddings
 from langchain.vectorstores import FAISS
 import os
 from typing import Optional, Tuple