v0.8.0 "Reified"

The parsed output is now a bit more convenient, with the addition of the Item wrapper and Filter for filtering the output.

The motivation here was to reduce the amount of janky code in my site for transforming item hashes into data ready for display on my site's "Reading" page. With these added conveniences, my sites' load_reading_list.rb has been reduced from 300 lines down to 94 lines ;🎉 Not only is it shorter, but it's also more robust because Item and Filter are covered by tests.

For next steps, I still have my eye on a v0.9.0 that adds a statistics CLI as in my old project Readstats, but for now I'll take a long break while I work on other things: improving my aforementioned site, chipping away at my Learn Ruby list, and (last but definitely not least) becoming a parent in a couple months 👶