Update app.py

app.py

@@ -10,6 +10,7 @@ from langchain_core.prompts import ChatPromptTemplate
 from langchain_core.runnables import RunnableParallel, RunnablePassthrough
 from langchain_openai import ChatOpenAI
 from langchain_groq import ChatGroq
+from langchain_anthropic import ChatAnthropic
 from langchain_core.messages import AIMessage, HumanMessage, get_buffer_string
 from langchain.memory import ConversationBufferMemory
 from langchain_core.runnables import RunnableLambda