docs: function stringify(obj) {
    if (!isObject(obj)) {
      throw new Error('`Stringify`\'s first argument should be an object')
    }
  
    var meta = Object.keys(obj)
      .map(function (key) {
        return getLine(key, obj[key])
      }).join('')
  
    return '// ==UserScript==\n' + meta + '// ==/UserScript==\n'
  }