Update app.py

app.py

@@ -5,7 +5,7 @@ import pickle
 from langchain.chains import ConversationChain
 from langchain.memory import ConversationBufferMemory
 from langchain.tools import Tool
-from langchain.agents import ToolAgent, AgentType
+from langchain.agents import AgentType
 from langchain.chains import LLMChain
 from langchain.prompts import PromptTemplate
 from langchain.chains.question_answering import load_qa_chain