Cannot increase buffer size for persistent actor connection

[ghostbuster91]

Hi,

The method which defines this buffer is defined on AbstractPersistentSubscriptionActor which is package private as the only one actor which implement this interface.

private[eventstore] trait AbstractPersistentSubscriptionActor[T] extends Actor with ActorLogging {
//....
  def subscribeToPersistentStream(): Unit = toConnection(PS.Connect(EventStream.Id(streamId.streamId), groupName, BUFFER_SIZE))
}

Can we make it somehow configurable?