Adding optional a href link for images

[angelacastaneda]

Hey big fan of your package. I used to always write insanity in pandoc markdown to get the functionality your code provides:

![figcaption](/path/to/img.jpg `title'){alt="alt text"}

anyways, I was hoping you could add a feature to optionally toggle a hyperlink to the image itself, e.g.

![alt text](/path/to/img.jpg "title")
figcaption

generates

<figure>
  <a href="/path/to/img.jpg">
    <img src="/path/to/img.jpg" alt="alt text" title="title"/>
  </a>
  <figcaption>figcaption</figcaption>
</figure>

That way you can just click on an image to zoom in. Thanks again for the cool package.

[yilei]

Thank you for the FR @angelacastaneda!

I just published a new version v1.1.0 to optionally add an image link, see instructions.

Feel free to open another issue if you encounter any problems.