Revert "Suppress deprecation warning"

This reverts commit b33b462.

Author: Jaden Peterson

macros/src/main/scala/enumeratum/compat/EnumMacros.scala

@@ -3,7 +3,6 @@ package compat
 
 import ContextUtils.Context
 
-import scala.annotation.nowarn
 import scala.collection.immutable._
 import scala.util.control.NonFatal
 
@@ -107,7 +106,7 @@ object EnumMacros {
     import c.universe._
     val enclosingBodySubClassTrees: List[Tree] =
       try {
-        val enclosingModule = (c.enclosingClass: @nowarn) match {
+        val enclosingModule = c.enclosingClass match {
           case md @ ModuleDef(_, _, _) => md
           case _ =>
             c.abort(