don't try to use 2.12 ScalaCheck

Author: SethTisue

build.sbt

@@ -74,7 +74,7 @@ lazy val junit = project.in(file("junit"))
 lazy val scalacheck = project.in(file("scalacheck"))
   .settings(commonSettings)
   .settings(
-  libraryDependencies += "org.scalacheck" % "scalacheck_2.12" % "1.14.0",
+  libraryDependencies += "org.scalacheck" %% "scalacheck" % "1.14.0",
   fork in Test := true,
   testOptions in Test += Tests.Argument(TestFrameworks.ScalaCheck, "-workers", "1", "-minSize", "0", "-maxSize", "4000", "-minSuccessfulTests", "5"),
   disablePublishing