This release removes a number of deprecated methods and attributes, for a cleaner, more consistent API. See the changelog for details.
First, you can get the average number of entries per day for the last 1, 3, 12 months, so you know how often a feed publishes new entries, and how that changed over time – think sparklines: 36 entries ▄▃▁ (4.0, 2.0, 0.6).
Second, reader records the time when an entry was last marked as read or important. This will allow you to see how you engage with new entries – I'm still working on how to translate this data into a useful summary.
A nice side-effect of knowing when entry flags changed is that it's possible to tell if an entry was explicitly marked as unimportant (entries are unimportant by default).
You can now add entries to existing feeds. This is useful when you want to keep track of an article that is not in the feed anymore because it "fell off the end".