[Feature] Change the arch update news icon when there is a new entry

[Kingproone]

So I don't know how it is implemented, or if the list is cached at all, but my idea would be to check the news upon opening the widget (this could be in the background too, for less friction), and compare the list that has been cached (if u use cache), if there is no cache the latest entry could be saved for reference. The icon could get an exclamation mark.