Update public GitHub repo with latest version available

[briansmith]

I notice that it has been almost two years since this repo had a commit added to it. Is it possible that there might be a non-public version of this repo that has been updated more recently, from which this public repo could be updated? I am particularly hoping there are new test vectors.

And/or, could you otherwise indicate whether (a) this is the latest version, (b) this repo is still supported? I noticed that there is one open approved PR that has been waiting to be merged for over a year.