Holds overloaded Json4s CustomSerializer generators for various Enumeratum ValueEnums

scala> import enumeratum.values._
scala> import org.json4s._
scala> import org.json4s.native.Serialization

scala> sealed abstract class ShirtSize(val value:Int) extends IntEnumEntry
scala> case object ShirtSize extends IntEnum[ShirtSize] {
    |  case object Small  extends ShirtSize(1)
    |  case object Medium extends ShirtSize(2)
    |  case object Large  extends ShirtSize(3)
    |  val values = findValues
    | }

scala> implicit val formats = Serialization.formats(NoTypeHints) + Json4s.serializer(ShirtSize)

scala> Serialization.write(ShirtSize.values)
res0: String = [1,2,3]