v0.12.9

6cf0f2d cut 0.12.9
e1bb74c Bump machine
9250d23 Report an error when trying to change unsupported field

hyperkit binary comes from https://app.circleci.com/pipelines/github/moby/hyperkit/jobs/769/artifacts

$ ./hyperkit -v
hyperkit: v0.20200224-44-gb54460

Homepage: https://github.com/docker/hyperkit
License: BSD

qcow-tool comes from https://desktop.docker.com/mac/stable/48506/Docker.dmg, released 2020-09-28

$ ./qcow-tool --version
1.0.0