commonmark-java 0.18.0

Changed

• Update to CommonMark spec 0.30:
  • Add textarea to list of literal HTML block tags.
    Like script, style, and pre, textarea blocks can contain
    blank lines without the contents being interpreted as commonmark.
  • Fix case folding for link reference labels in some cases
    (e.g. ẞ and SS should match)
  • Allow lowercase ASCII in HTML declaration
  • Don't let type 7 HTML blocks interrupt lazy paragraphs either
• Preserve the original case for the label of LinkReferenceDefinition.
  Before, we used to store the normalized version (lowercase, collapsed whitespace).