DateTimeCron.apply can't resolve typeclass instance

[alonsodomin]

Method apply in DateTimeCron companion can not summon typeclass instances as it's type signature is wrong:

scala> DateTimeCron[CronExpr]
<console>:21: error: wrong number of type parameters for method apply: [T, DateTime](implicit ev: cron4s.datetime.DateTimeCron[T])cron4s.datetime.DateTimeCron[T] in object DateTimeCron
       DateTimeCron[CronExpr]

Current type signature is:

def apply[T, DateTime](implicit ev: DateTimeCron[T]): DateTimeCron[T]

When it should be:

def apply[T](implicit ev: DateTimeCron[T]): DateTimeCron[T]