Missing “download” from image-source-link

Files: robo_gallery.js and robo_gallery_alt.js

The original part is:

<a class="image-source-link" href="'+e+'" target="_blank">

And it could be like this to directly download the image (as in most lightboxes) instead of just opening it in a new tab:

<a class="image-source-link" href="'+e+'" download target="_blank">

I hope it can be added, thank you very much.