I was able to use the built in unity package manager manifest using the following line:
`"net.wraithavengames.unityinterfacesupport": "https://github.com/TheDudeFromCI/Unity-Interface-Support.git?path=/Packages/net.wraithavengames.unityinterfacesupport",`
Thanks for the tip. I haven't been following Unity's updates for the past few months, so I haven't really kept up with the new package manager protocols. I added the installation info to the readme.