title: require('node-fetch') gives ERR_REQUIRE_ESM
body: <p>I just use</p>
  <pre class="lang-js prettyprint-override"><code>const fetch = require('node-fetch')
  </code></pre>
  <p>And I get</p>
  <pre class="lang-none prettyprint-override"><code>Error [ERR_REQUIRE_ESM]: require() of ES Module C:\Users\Alex\Desktop\rollbot\node_modules\node-fetch\src\index.js from C:\Users\Alex\Desktop\rollbot\index.js not supported.
  Instead change the require of C:\Users\Alex\Desktop\rollbot\node_modules\node-fetch\src\index.js in C:\Users\Alex\Desktop\rollbot\index.js to a 
  dynamic import() which is available in all CommonJS modules.
  {
    code: 'ERR_REQUIRE_ESM'
  }
  </code></pre>
  <p>All my other packages work, just node-fetch does this. What should I do in order to use node-fetch?</p>