Update app.py

app.py

@@ -125,7 +125,7 @@ def talk(prompt, history):
     print("history log")
     print(str(historylog))
     print("history log printed")
-    with open('file.txt', 'w+') as data:
+    with open('file.txt', 'a') as data:
         data.write(str(historylog))
         data.seek(0)
         print(data.read())