Upgrade scala to 2.12.5 (#318)
Upgrade scala to 2.12.5 (#318)

- 'scalaVersion in ThisBuild := "2.12.4"' => 'scalaVersion in ThisBuild := "2.12.5"'
 - 'crossScalaVersions := Seq("2.11.12", "2.12.4")' => 'crossScalaVersions := Seq("2.12.5", "2.11.12")'
flowcommerce/lib-event