Update for SBT 1.0, Scala 1.12

[justgerd]

I don't know how far this project is still active, but I hope that it is possible to update it to current versions of Scala and SBT

[unoexperto]

@pfn Could you please comment? Thanks!

[kpritam]

This pull request has been merged : #35

Waiting for a v2.0.0 release which will have these changes!

[unoexperto]

@kpritam That's nice. Do you have published artifact for the snapshot of the plugin by any chance ?

[kpritam]

For time being we are publishing it to our bintray account:

resolvers += Resolver.bintrayRepo("twtmt", "sbt-plugins")
addSbtPlugin("com.github.tmtsoftware" % "kotlin-plugin" % "2.0.1-RC1")