If it were completed, the author should have closed/rejected every issue and pull request and removed this large warning at the top of the README:

> THIS PROJECT IS STILL IN EARLY DEVELOPMENT IT USES EXPERIMENTAL CRYPTOGRAPHIC LIBRARIES AND IT HAS NOT HAD ANY KIND OF SECURITY OR CRYPTOGRAPHY REVIEW THIS SOFTWARE MIGHT BE BROKEN AND UNSAFE

Plus, install instructions are outdated. As soon as I tried them, `go` complained of using a deprecated method.

So everything points to it no longer being under development.