Bump to Scala 2.12.0-RC2

[retronym]

Performed with:

git grep -l 2.12.0-RC1 | xargs perl -p -i -e 's/2.12.0-RC1/2.12.0-RC2/'

[retronym]

@2m Could you either merge this PR and publish a new version, or alternatively manually back-publish com.typesafe.genjavadoc#genjavadoc-plugin_2.12.0-RC2;0.10 (the version I need for scala-java8-compat.) ?

[ktoso]

Sure, gladly once it passes hm.
Currently failed on RC2: https://travis-ci.org/typesafehub/genjavadoc/jobs/168754833

There's some silly diff... we need to look at it. Can do tomorrow.

[retronym]

Thanks for investigating. I've used the RC1 build to release scala-java-compat_2.12.0-RC2, so this isn't super urgent.

[2m]

Thanks @retronym. You missed one file, that had to be renamed to RC2. I fixed it here #91.