Since I've had problems in the past with fab houses not making the tiny
holes for USB Type-C receptacles properly, I started looking for a
solution that would ensure I can reliably make these boards.  Inspired
by https://hackaday.io/project/28516-business-card-gamepad, I created
USB Type-C receptacles for the PCB edge in KiCad.  Now I don't have to
populate the receptacles at all (forgoing the shield pads, which were
unreliable in my testing, and did not impact functionality), meaning the
Wye boards are easier and cheaper to make.  You know what that means:
price reduction!

This updates the project to recent KiCad 5 nightlies.

Now it's slightly under 25×20 mm, instead of slightly under 25×21 mm.

The new USB connector footprints have been merged into the KiCad library
now, so I can use them from there instead of from my own fork.

This bumps the version number to v1.1.  This version is not complete
yet; I plan to make the board a bit smaller before I call the next
version "done".

Since I plan on getting these made at OSH Park, I shouldn't use
footprints with plated slots.  Now I'm using the CircularHoles
variant of the USB Type-C connector footprint, which is more
OSH-Park-friendly.

This may mean that I need to make a minor board revision after the
footprints are merged.  Not that I mind terribly.