Optimizing CSS Delivery of google fonts.

Hi ,

So I've recently got a hang of using Hummingbird but I have a problem of how to properly take care of Optimize CSS Delivery of the Google Fonts such as :
http://fonts.googleapis.com/…s?family=Raleway:regular,500,600,700,900

What is m best course of action for this? I've already used asset optimization on all of my CSS however this file does not show in my list.

Thank you!