Update scalacheck to 1.15.0

Author: 47erbot

build.sbt

@@ -19,7 +19,7 @@ lazy val V = new {
   val runtime: String             = "0.6.4"
   val scala: String               = "2.13.3"
   val scala212: String            = "2.12.12"
-  val scalacheck: String          = "1.14.3"
+  val scalacheck: String          = "1.15.0"
   val scalacheckShapeless: String = "1.2.5"
   val scalamacros: String         = "2.1.1"
   val scalariform: String         = "0.2.10"