TODO for WWW::FetchStory
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1. add more tests
2. add category-parsing to other fetchers
3. enable Fetcher to grab EPUB files directly from Gutenberg and update their metadata
4. fix fetching of EPUB from AO3
5. fix bug Ashwinder characters are coming out as ARRAY
6. fix docs bug - explain about the HTML parsing error messages
7. add Published and Updated metadata
8. enable Fetcher to grab image files and add them to EPUB generation