Character limit for caption

Hello,

Great plugin, I just have one feature request.

Is there a way that you can add the ability to limit how long the caption can be or if you could hard code it for the next release. Right now I add
$output .= substr($caption,0,355);
on shortcode.php on line 317 and it limits the characters to 355. The only issue with this is that I need to update it when you update the plugin.

If you don’t limit the user can fill up the entire image with text.

Thanks,

Aaron

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