title: 'kapt.generateStubs' is not used by the 'kotlin-kapt' plugin
body: <p>I recently updated from Android Studio 2.3 to 3.0, and kotlin <code>1.1.4</code> to <code>1.1.51</code>.</p>
  
  <p>Now I'm seeing this message in my gradle console:</p>
  
  <blockquote>
    <p>'kapt.generateStubs' is not used by the 'kotlin-kapt' plugin</p>
  </blockquote>
  
  <p>I have this in my <code>build.gradle</code> to get my project working with some libraries using annotation processing:</p>
  
  <blockquote>
    <p>kapt { generateStubs = true }</p>
  </blockquote>
  
  <p>Is the <code>generateStubs</code> line no longer needed and is it safe to remove? Or is there another action I should take to remove the warning message above?</p>