Make a PR to the main keras repo?

[zachmayer]

I think it might make sense to add this optimizer to the main keras repo!

[zachmayer]

See also keras-team/keras#12352

[titu1994]

It probably won't be added right away, but it can possibly be done so after a few months of it being tested.

[iperov]

make PR to keras-contrib.

[okbalefthanded]

I suggest a PR to Tensorflow-addons https://github.com/tensorflow/addons
their release schedule is faster.