support history

Signed-off-by: Zhang Jun <jzhang533@gmail.com>

app.py

@@ -26,13 +26,7 @@ def respond(
     top_p,
 ):
     messages = [{"role": "system", "content": system_message}]
-
-    for val in history:
-        if val[0]:
-            messages.append({"role": "user", "content": val[0]})
-        if val[1]:
-            messages.append({"role": "assistant", "content": val[1]})
-
+    messages.extend(history)
     messages.append({"role": "user", "content": message})
 
     response = client.chat.completions.create(