Gradle : DSL element 'useProguard' is obsolete and will be removed soon : <p>Since the 3.5 update of Android Studio, I have this warning when building my app :</p>

<blockquote>
  <p>DSL element 'useProguard' is obsolete and will be removed soon. Use
  'android.enableR8' in gradle.properties to switch between R8 and
  Proguard..</p>
</blockquote>
