commonmark.js 0.29.1

• Export Renderer (#162, Federico Ramirez). Export the Renderer
  class so consumers can use it as a base class for their own custom
  Renderer's. [API change]
• Fix end source position for fenced code and raw HTML (#141).
• Ensure that \ is treated as punctuation character (#161).
• Remove redundant token from reHtmlBlockOpen (Vas Sudanagunta).
• Remove unused variable reWhitespace.
• Don't decode url before encoding it again (Daniel Berndt).
• Don't allow link destinations with unbalanced unescaped parens (#177).
• Don't put quote delims on stack if not --smart.
• Don't add to delim stack if !can_open && !can_close (#172).
• Remove no longer used argument to escapeXml (#169, Robin Stocker).
• Avoid numerical conversion for file names in argv (#164, Alex Kocharin).
• Adapt existing encoding-based regression test and add %25-based
  regression test (Daniel Berndt).
• Add pathological test for #172 illustrating quadratic time bug.
• Fix pathological case commonmark/cmark#178.
• Add pathological test for cmark#178.
• Dingus: remove debugging console.log.
• Sync .editorconfig indent_size to actual (#178, Vas Sudanagunta).
• Add lint rule for unused variables
• Apply npm audit suggestions.
• Fixed invalid package.json dependency entries (Vas Sudanagunta).