publish for Scala 2.12.0-RC1?

perhaps useful, Adriaan's changes to make it work in the Scala 2.12 community build:
- https://github.com/adriaanm/util/commit/17625f46400dcc3b777168e47b8244f932372794 
- https://github.com/adriaanm/util/commit/2bb041a2a3bf9086066d52df3ee954c45c7c2d8b
