title: How correctly update Flow?
body: <p>updated flow-bin with <code>yarn global add flow-bin@latest</code>. <code>yarn global ls</code> shows <strong>"flow-bin@0.38.0"</strong>. <code>flow version</code> shows <strong>Flow, a static type checker for JavaScript, version 0.37.4</strong>. How update flow to latest version?</p>
  
  <p>OS: Linux Ubuntu 16.04</p>
  
  <p>Yarn: latest</p>
  
  <p>P.S. I also did reboot several times...</p>
  
  <p>Thanks for any help!</p>