function Entry(logger, level, msg) {
  this.v = 0
  this.level = level
  this.name = logger.name
  this.hostname = logger.hostname
  this.pid = process.pid
  this.time = new Date().toISOString()
  this.msg = msg
}
For performance reasons we do not support %j because we will have
already converted the objects to strings.
Returns a boolean representing the status of the write
(success/failure)

@param level
@param args
@param extra