Hi, here's a quick question pertaining to the CumulusCI.yml.  I'm trying to create a scratch org with NPSP, Outbound Funds, and the Outbound Funds NPSP Extension packages.  

I have the following dependencies defined, but how do I define the Outbound Funds NPSP Extension?  Is there a GitHub repo for it?  Should I reference its namespace and version instead?

dependencies:

 - github: 'https://github.com/SalesforceFoundation/NPSP'

 - github: 'https://github.com/SalesforceFoundation/OutboundFunds'