Included example board does not render with background

[smkent]

I'm new to pcbdraw and am trying to get it to work with KiCad 8. I have a branch with #164, #165, and #166 applied. With those fixes, I can invoke pcbdraw plot without errors with KiCad 8 but the renders I'm getting are blank or incomplete.

In attempting to render the example ArduinoLearningKitStarter.kicad_pcb board, I'm getting an SVG output with the components but no board outline/background.

Invocation:

pcbdraw plot examples/resources/ArduinoLearningKitStarter.kicad_pcb -m examples/resources/remap.json test.svg

Rendered SVG: