Update app.py

app.py

@@ -129,7 +129,7 @@ async def on_message(message):
         await syncMessages()
     for user in message.mentions:
         message.content = message.content.replace(f"<@{user.id}>",
-                                                  f"@{str(user)}")
+                                                  f"<@{str(user)}>")
     try:
         msgchannel = message.channel
         try: