[css-color-4] Update changes section

Author: svgeesus

css-color-4/Overview.bs

@@ -2687,6 +2687,15 @@ And thanks to Chris Lilley for being the resident CSS Color expert.
 <h2 id='changes' class='no-num'>
 Changes</h2>
 
+<h3 id="changes-from-20191105" class="no-num">Changes since
+<a href="https://www.w3.org/TR/2019/WD-css-color-4-20191105/">Working Draft of
+5 November 2019</a></h3>
+
+<ul>
+	<li>Removed confusing gray() function per CSS WG resolution</li>
+	<li>Minor editorial clarifications, bikeshed markup fixes</li>
+</ul>
+
 <h3 id="changes-from-20160705" class='no-num'>Changes since <a href="http://www.w3.org/TR/2016/WD-css-color-4-20160705/">Working Draft of 05 July 2016</a></h3>
 
 <ul>