Update app.py

app.py

@@ -2,7 +2,7 @@ from langchain_community.document_loaders import UnstructuredMarkdownLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain_core.documents import Document
 from langchain_huggingface import HuggingFaceEmbeddings
-from langchain_community.vectorstores import Chroma
+from langchain_chroma import Chroma
 from langchain_community.llms import HuggingFaceHub
 from langchain.prompts import ChatPromptTemplate
 from dotenv import load_dotenv