[Snyk] Upgrade fibers from 3.0.0 to 4.0.1

[snyk-bot]

Snyk has created this PR to upgrade fibers from 3.0.0 to 4.0.1.

Warning: This is a major version upgrade, and may be a breaking change.

• The recommended version is 4 versions ahead of your current version.
• The recommended version was released 6 months ago, on 2019-05-02.

Release notes

• Package name: fibers
  • 4.0.1 - 2019-05-02

      </li>
      <li>
        <b>4.0.0</b> - <a href="">2019-04-29</a>
        
      </li>
      <li>
        <b>3.1.1</b> - <a href="https://github.com/laverdet/node-fibers/releases/tag/3.1.1">2018-11-21</a>
        <p>Includes a fix for linux binaries on nodejs version 8.x. No source<br>
    

    changes.

    
    
  
  
  • 
    3.1.0 - 2018-11-20
    

    By dropping this unneeded function call we can use glibcxx >=3.4.9
    
    instead of >=3.4.20.

    
    
  
  
  • 
    3.0.0 - 2018-07-31

      </li>
    </ul>
    

  from [`fibers` GitHub Release Notes](https://github.com/laverdet/node-fibers/releases)

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