clean up trailing whitespace

Merge pull request #193 from scala/plugin-3.0

Merge pull request #179 from scala-steward/update/sbt-version-policy-…

…1.0.0

backpublish 1.0.2 for Scala 3.0.0-RC3

Merge pull request #169 from SethTisue/scala-3.0.0-RC2

Scala 2.13.5 (was 2.13.4) (#162)

Backpublish 1.0.0 for Scala 3.0.0-RC1

Backpublish 1.0.0 for Scala 3.0.0-M3

backpublish 1.0.0 for Scala 3.0.0-M2