title: failed to load csv file using csv-loader
body: <p>I am learning webpack-loader, and using csv-loader to load a csv file.
  <img src="https://i.stack.imgur.com/rcQBy.png" alt="">
  <img src="https://i.stack.imgur.com/Ey4jG.png" alt="">
  I have already install the csv-loader and add the rule. However, webpack log an </p>
  
  <blockquote>
    <p>error:  Cannot find module 'papaparse'.
    <img src="https://i.stack.imgur.com/LBYil.png" alt=""></p>
  </blockquote>
  
  <p>How do this error happened? </p>