2.0.0

• Upgraded to parse5 v2.2.1
• (breaking) Because parse5 2.x correctly handles <template> elements,
  the nodeWalk* and query* functions will no longer return results from within
  <template>s. Code that relied on this must explicitly walk into template
  content documents.
• (breaking) Removed parse(), parseFragment() and serialize(). Use
  parse5.parse(), etc., instead.
• Nodes can be appended to parents with a null childNodes array.
• DocumentFragments that are appended have their childNodes array cleared,
  rather than getting a new empty childNodes instance.