Nodejs slowly output a file line by line

gistfile1.txt

// to simulate some recordered arduino output that print a value each 100ms on a serial terminal
// thanks to https://github.com/mcollina and https://gist.github.com/walling/

'use strict';

var fs = require('fs'),
    split2 = require('split2'),
    through = require('through2')
var filename = process.argv[2];

fs.createReadStream(filename)
  .pipe(split2())
  .pipe(slowRelease())
  .on('data', function (line) {
      console.log('.',line);
  });

function slowRelease() {
    return through(
        { objectMode: true },
        function(buffer, encoding, callback) {
            var self = this;

            setTimeout(function(buffer) {
                self.push(buffer);
                callback();
            }, 100, buffer);
    });
}