Links are not formatted correctly

[raxod502-plaid]

Hi, I tried using this library to translate some basic Markdown and received an unexpected result:

> console.log(JSON.stringify(require("md-to-adf")("link 1 <https://example.com> and link 2 [here [brackets] there](https://example.com)"), null, 2))
{
  "type": "doc",
  "content": [
    {
      "type": "paragraph",
      "content": [
        {
          "type": "text",
          "text": "link 1 <https://example.com> and link 2 [here [brackets] there](https://example.com)"
        }
      ]
    }
  ],
  "version": 1
}

Neither link is formatted correctly, although other compliant Markdown parsers translate them both properly as links, e.g.:

% pandoc -fmarkdown -thtml <<< "link 1 <https://example.com> and link 2 [here [brackets] there](https://example.com)"
<p>link 1 <a href="https://example.com"
class="uri">https://example.com</a> and link 2 <a
href="https://example.com">here [brackets] there</a></p>