Update app.py

app.py

@@ -57,7 +57,7 @@ def main():
   if "chat_history" not in st.session_state:
     st.session_state.chat_history = None
 
-  st.header("Chat with PDF")
+  st.header("PDF Copilot")
   user_question = st.text_input("Ask a question about your documents...")
   if user_question:
     user_input(user_question)