gatsby-remark-images not show captions in md file

[XHMM]

When i write image like this ![my image](../img.jpg) in markdown file ,
gatsby-remark-images not show captions (because source code only detect img.title),

(PS: I have enabled showCaptions in gatsby-config.js file)

so I have to write like <img src="../img.jpg" title="my image"></img> instead.
But when I switched to use gatsby-mdx later,
<img src="../img.jpg" title="my image"></img> not worked (I watched output, src not replaced by processed images under static files, maybe a bug?) ,

so I have to write back ![my image](../img.jpg) again,
but captions not showed in this way,

so can you change const showCaptions = options.showCaptions && node.title (source code ) to const showCaptions = options.showCaptions && (node.title || node.alt) or add something else to detect if image is written in ![my image](../img.jpg) style and add captions to it?

[DSchau]

This seems reasonable! We'd happily take a PR.

[jamessimone]

@DSchau saw your comment on this yesterday and submitted a PR for the issue this morning. Let me know what you think!

Thanks,
James