Issue title: Plugin update report
 Issue body: I'd like to have access to some sort of feed or report that details when plugins are updated. Perhaps plugin developers could put changes into this feed as well.
 Comments: 
 Comment 0: To note: I'm interested in seeing a feed for both official and external plugins. 
 Comment 1: https://github.com/runelite/plugin-hub/tree/master/plugins

Dates are public for each and usually summarized in the weekly update posts. 
 Comment 2: Plugin hub plugins have not been updated in our release blog posts yet.
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