I think it would be fair to at least mention the inheritance from https://github.com/coreos/container-linux-update-operator in the README.md , just to keep the historical context. I was just a bit puzzled while working on the second edition of k8spatterns.io, which references the original project as an example for a controller (without CRD).
Feel free to close that issue if this suggestion is too controversial (sorry, I have no insights at all into the relationship of the former CoreOS, Kinvolk, Flatcar projects, just thought that it would be fair to create a link to the former projects for the historical context (not talking about any potential license issues, ianal ...)