Update ProjectPlugin.scala

Author: juanpedromoreno

project/ProjectPlugin.scala

@@ -14,7 +14,7 @@ object ProjectPlugin extends AutoPlugin {
       val cats: String                = "2.1.1"
       val shapeless: String           = "2.3.3"
       val scala: String               = "2.13.2"
-      val scalaExercises: String      = "0.6.0-SNAPSHOT"
+      val scalaExercises: String      = "0.6.0"
       val scalacheck: String          = "1.14.3"
       val scalacheckShapeless: String = "1.2.5"
       val scalatest: String           = "3.1.1"