How can I use Burp Suite proxy with Ready API?

I am trying to run Ready API 1.4.1 through Burp Suite internet proxy and I keep getting a message in Burp that the certficate is unknown.  Normally, this would mean that I need to add the certificate to the trusted root for the browser but since this isn't using a browser I need to know how to get Ready API to use the cert. I am running on a Windows 7 box with Burp 1.6.30.