title: Constraint Layout gives error in default template in Android Studio 2.3
body: <p>I've updated Android Studio 2.3, after that I am getting default <code>ConstrainLayout</code> as template xml.</p>
  
  <p>But in that I have <code>RelativeLayout</code> as Child Layout and I getting following warning.</p>
  
  <p><strong>This view is not constrained, it only has designtime positions, so it will jump to (0,0) unless you add constraints.</strong></p>
  
  <blockquote>
    <p>The layout editor allows you to place widgets anywhere on the canvas,
    and it records the current position with design time attributes (such
    as layout_editor_absoluteX.) These attributes are not applied at
    runtime, so if you push your layout on a device, the widgets may
    appear in a different location than shown in the editor. To fix this,
    make sure a widget has both horizontal and vertical constraints by
    dragging from the edge connections.</p>
  </blockquote>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"&gt;
  
      &lt;android.support.constraint.ConstraintLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          app:layout_behavior="@string/appbar_scrolling_view_behavior"
          tools:context="com.pratikbutani.demoapp.MainActivity"
          tools:showIn="@layout/activity_main"&gt;
  
          &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              xmlns:tools="http://schemas.android.com/tools"
              android:id="@+id/content_main"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              tools:showIn="@layout/activity_main"
              tools:layout_editor_absoluteY="8dp"
              tools:layout_editor_absoluteX="8dp"&gt;
  
              &lt;android.support.v7.widget.RecyclerView
                  android:id="@+id/my_recycler_view"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:layout_centerHorizontal="true"
                  android:layout_centerVertical="true" /&gt;
  
          &lt;/RelativeLayout&gt;
  
      &lt;/android.support.constraint.ConstraintLayout&gt;
  &lt;/layout&gt;
  </code></pre>
  
  <p>Getting warning on <code>RelativeLayout</code>, What should I do?</p>