Update app.py

app.py

@@ -9,7 +9,7 @@ from langchain.chains import ConversationChain
 from langchain.chains.conversation.memory import ConversationBufferWindowMemory
 import os
 
-from langchain.schema import Runnable
+from langchain.schema.runnable import Runnable
 # from langchain.llms import HuggingFaceInference