Here are new features:
1. New WYSIWYG cover image editor
2. Add bulleted or numbered list to paragraph element
3. Specify filename when uploading to Google Drive
4. Generate and add QR code image
5. Preview table of contents
6. Enable and change line height
7. Configure item per page settings for glossary page
8. Upgrade to EPUB version 3.0
9. Fix validation errors for epubcheck
10. Add YouTube's video screenshot with video link
11. Fix bug for character "$"
12. Fix bug for generating book with a lot of elements
