title: Updated Android Studio to 3.0 and getting this issue
body: <pre><code>Error:Execution failed for task ':App:mergeDebugResources'.
      &gt; There were multiple failures while executing work items
         &gt; A failure occurred while executing com.android.build.gradle.tasks.MergeResources$FileGenerationWorkAction
            &gt; Error while processing /media/nikhilesh/App/src/main/res/drawable/ic_add_black_24dp.xml : Can't process attribute android:fillColor="@color/green": references to other resources are not supported by build-time PNG generation. See http://developer.android.com/tools/help/vector-asset-studio.html for details.
  </code></pre>
  
  <p>How can we solve this?</p>