added simlacrumSettings

src/main/scala/sbtcatalysts/CatalystsPlugin.scala

@@ -386,14 +386,21 @@ trait CatalystsBase {
     } yield Credentials("Sonatype Nexus Repository Manager", "oss.sonatype.org", username, password)).toSeq
   )
 
-  lazy val xlint = Seq(
+  lazy val xlintSettings = Seq(
     scalacOptions += {
       CrossVersion.partialVersion(scalaVersion.value) match {
         case Some((2, 12)) => "-Xlint:-unused,_"  //Xling:unused warn against unused implicit evidence
         case _ => "-Xlint"
       }
     }
   )
+
+  def simulacrumSettings(v: Versions) = Seq(
+    libraryDependencies ++= Seq(
+      "com.github.mpilquist" %%% "simulacrum" % v.vers("simulacrum") % "compile-time"),
+     ivyConfigurations += config("compile-time").hide,
+     unmanagedClasspath in Compile ++= update.value.select(configurationFilter("compile-time"))
+  )
   // Builder methods
 
   /**