Play 2.7.0-RC3 and sbt upgrade

[mkurz]

Upgrades to Play 2.7.0-RC3 🎉

Also upgrades sbt to 1.2.x - which mean I had to finally migrate project/Build.scala to build.sbt. (They are very similar however, I cleaned it up a bit).

BTW: Play 2.7.0-RC3 wasn't released for Scala 2.13 yet. That will happen in a future version.

[mkurz]

RC3 has been officially released now: https://discuss.lightbend.com/t/play-2-7-0-rc3-released/2715

[mkurz]

Added two more commits.
@mumoshu Looking forward to your review 😉

[mkurz]

Ping @mumoshu (Please also merge #67, thanks)

[mumoshu]

Awesome work @mkurz! Thanks as always for your continuous support. LGTM.

[mumoshu]

Im now releasing this for Scala 2.11.12.. Thanks for patience

PLAY_VERSION=2.7.0-RC8 sbt ++2.11.12 publishSigned sonatypeRelease

[mumoshu]

[error] (scala-sample / publishConfiguration) Repository for publishing is not specified.
[error] (java-sample / publishConfiguration) Repository for publishing is not specified.
[error] (publishConfiguration) Repository for publishing is not specified.
[error] Total time: 57 s, completed 2018/11/30 11:18:11

[mumoshu]

So running em separately seems to work.

PLAY_VERSION=2.7.0-RC8 sbt ++2.11.12 publishSigned
PLAY_VERSION=2.7.0-RC8 sbt ++2.11.12 sonatypeRelease

[mumoshu]

And for 2.12.7 too.

PLAY_VERSION=2.7.0-RC8 sbt ++2.12.7 sonatypeRelease

[mumoshu]

Done publishing.

[mkurz]

Please git-tag the releases, thanks! Maybe we can use https://github.com/sbt/sbt-release in future which can automatically publish and then tag the releases...