docs: function many (urls, options = {}) {
    let flowMethod = (options.waitTime) ? flow.series : flow.parallel
  
    // Call the single method while respecting the wait time in between tasks
    const callSingle = (url) => single(url, options)
      .then(content => wait(() => content, options.waitTime))
  
    // Map over the urls and call them using the method the user chose
    let promises = urls.map(url => () => callSingle(url))
    return flowMethod(promises)
  }