Update app.py

app.py

@@ -3,7 +3,7 @@ import sys
 sys.modules['sqlite3'] = sys.modules.pop('pysqlite3')
 from langchain_community.llms import Ollama 
 from langchain_community.document_loaders import PyPDFLoader
-from path import Path
+from pathlib import Path
 from langchain.chains import create_history_aware_retriever
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain.chains import create_retrieval_chain