Update spec to include newline before and after [chapter]
Update spec to include newline before and after [chapter]

legokichi/pixiv-novel-parser,pixiv/pixiv-novel-parser,legokichi/pixiv-novel-parser,pixiv/pixiv-novel-parser,legokichi/pixiv-novel-parser,pixiv/pixiv-novel-parser,pixiv/pixiv-novel-parser,legokichi/pixiv-novel-parser