SSL serves http not https

Hi Joe,

Thank you for such a great and useful plugin.

I use SSL socket site wide at http://www.vintageheirloom.com. After installing your plugin I get a broken SSL socket.

> Inspect > Console I can see a message about mixed content. When I check the element I can see the src is set to https as expected but your plugin dynamically is serving srcset as http.

I’ve included some screenshots so you can see this.

https://drive.google.com/file/d/0B_SKBXnypFg-SmdoRV9peUZoWUU/view?usp=sharing
https://drive.google.com/file/d/0B_SKBXnypFg-UXRmLUhxVTZQWEU/view?usp=sharing

I am confident my site is serving https assets.

I’ve disabled your plugin for now.
Hope you can help.
Thanks for looking.
Kevin

https://ww.wp.xz.cn/plugins/ricg-responsive-images/