Add last updated timestamp for each filter file

[InLem]

Can you add an update timestamp to each filter in DNSNet? Since DNSNet’s filters occasionally fail to update, having the time displayed would help me notice when something goes wrong.

Original Chinese:
可以給DNSNet的每個過濾器加上更新時間嗎？因為DNSNet的過濾器偶爾會更新失敗，如果有顯示時間我就能發現有問題。