[css-page-3] Update Changes list

Author: fantasai

css-page-3/Overview.bs

@@ -2490,6 +2490,11 @@ This specification introduces no new privacy or security considerations.
 <h2 class="no-num" id="changes">
 Changes</h2>
 
+	Changes since the <a href="https://www.w3.org/TR/2018/WD-css-page-3-20181018/">18 October 2018 Working Draft</a> are:
+	<ul>
+		<li>Added 'page-orientation' descriptor.
+	</ul>
+
 	Changes since the <a href="https://www.w3.org/TR/2013/WD-css3-page-20130314/">14 March 2013 Working Draft</a> are:
 
 	<ul>