code: function displaySummary(config) {
    console.info([
      'shrinkpack',
      chalk.green('+' + config.stats.unbundled.total),
      chalk.red('-' + config.stats.bundled.unused),
      chalk.yellow('↓' + config.stats.unbundled.uncached),
      chalk.magenta('→' + config.stats.unbundled.cached),
      chalk.green('✓' + config.stats.unbundled.unresolved),
      chalk.grey(getTimeBetween(config.startTime, new Date()))
    ].join(' '));
  }
docs: implementation