[css-color-4] update changes

Author: svgeesus

css-color-4/Overview.bs

@@ -5151,6 +5151,18 @@ parsing/color-valid.html
 <h2 id='changes' class='no-num'>
 Changes</h2>
 
+<h3 id="changes-from-20210601" class="no-num">Changes since the
+	<a href="https://www.w3.org/TR/2021/WD-css-color-4-20210601/">Working Draft of 1 June 2021</a>
+</h3>
+
+<ul>
+	<!-- to 9 July 2021 -->
+	<li>Added Lea Verou as co-editor by WG resolution</li>
+	<li>Clarified that hue angle is unbounded</li>
+	<li>MarkText example corrected</li>
+	<li>Minor typos corrected</li>
+</ul>
+
 <h3 id="changes-from-20201112" class="no-num">Changes since the
 	<a href="https://www.w3.org/TR/2020/WD-css-color-4-20201112/">Working Draft of 12 November 2020</a>
 </h3>