Tables with captions in paragraphs need an empty line

[wheelercj]

If a table with a caption is in a paragraph element, the table does not correctly convert from HTML to markdown because there is no empty line between the caption and the table in the result.

For example, the HTML below results in the markdown after it.

<p>
  <table>
    <caption>Here's a caption.</caption>
    <tr>
      <td>history</td>
      <td>absorption</td>
    </tr>
    <tr>
      <td>analyst</td>
      <td>retire</td>
    </tr>
  </table>
</p>

**Here's a caption.**
| history | absorption |
| --- | --- |
| analyst | retire |

Expected behavior
There should be an empty line between the caption and the table so that markdown renderers will recognize the table as a table.