link to Godot integration

[troy-lamerton]

There is a renderer for OpenSeeFace data that Timothy wrote for the Godot engine.

https://github.com/you-win/openseeface-gd

When I searched this repo for 'godot', there was no results. For people using Godot, it would be nice to find this in the readme. Perhaps in a section titled "See Also"?

[emilianavt]

That's a good point. I've added a link.