title: Using the ‘stage’ step without a block argument is deprecated
body: <p>When building a Jenkins pipeline job (Jenkins ver. 2.7.4), I get this warning:</p>
  
  <pre><code>Using the ‘stage’ step without a block argument is deprecated
  </code></pre>
  
  <p>How do I fix it?</p>
  
  <p>Pipeline script snippet:</p>
  
  <pre><code>stage 'Workspace Cleanup'
  deleteDir()
  </code></pre>