Update app.py

app.py

@@ -3,6 +3,7 @@ from langchain import hub
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import Chroma
 from langchain.vectorstores import Chroma
+import chromadb
 from langchain_core.output_parsers import StrOutputParser
 from langchain_core.runnables import RunnablePassthrough
 import bs4