title: Databinding annotation processor kapt warning
body: <p>In my app module's build.gradle, I have added </p>
  
  <pre><code>dependencies {
  kapt('com.android.databinding:compiler:3.1.2')
  ...
  }
  </code></pre>
  
  <p>but I'm still receiving the compiler warning for </p>
  
  <pre><code>app: 'annotationProcessor' dependencies won't be recognized as kapt annotation processors. Please change the configuration name to 'kapt' for these artifacts: 'com.android.databinding:compiler:3.1.2'.
  </code></pre>
  
  <p>Everything functions, I just hate having warnings hanging around.</p>
  
  <p>Any help is much appreciated!</p>