Nested paragraphs not work correctly inside arbitrary html

[m-architek]

Given markdown:

<div>
  Hello

  World
</div>

Current output:

<div>
  Hello

  World
</div>

Expected:

<div>
  <p>Hello</p>
  <p>World</p>
</div>

I think problem is missing paragraph rule regexp in BLOCK_SYNTAXES array (line 249)