Update main.py

main.py

@@ -21,6 +21,7 @@ from langchain_pinecone import PineconeVectorStore
 
 from offres_emploi import Api
 from offres_emploi.utils import dt_to_str_iso
+from langchain_community.chat_message_histories import ChatMessageHistory
 from langchain_core.chat_history import BaseChatMessageHistory
 from langchain_core.runnables.history import RunnableWithMessageHistory