Update app.py

app.py

@@ -3,8 +3,8 @@ import asyncio
 import os
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.prompts import SystemMessagePromptTemplate, HumanMessagePromptTemplate
-from langchain.vectorstores import Chroma
-from langchain.embeddings import OpenAIEmbeddings
+from langchain_community.vectorstores import Chroma
+from langchain_community.embeddings import OpenAIEmbeddings
 from langchain.chat_models import ChatOpenAI
 from PyPDF2 import PdfReader
 import aiohttp