v0.0.18

• Fixes previous known issue with images not being downloaded. Please upgrade from 0.0.17 to this version. (#51, #36)
• Fixes several issues with self closing tags making the generated EPUBs fail validation. (#51)
• Updates cheerio. (#41)
• Reuses downloaded images and avoids downloading the same image several times. (#51)
• Preserves content data whitespace. (#51)