[css-values-3] Update Changes list

Author: fantasai

css-values-3/Overview.bs

@@ -2431,6 +2431,8 @@ Acknowledgments</h2>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
+	Changes since the <a href="https://www.w3.org/TR/2019/CR-css-values-3-20190606/">6 June 2019 Candidate Recommendation</a> consist of minor editorial tweaks and fixes.
+
 	Changes since the <a href="https://www.w3.org/TR/2019/CR-css-values-3-20190131/">31 January 2019 Candidate Recommendation</a> are:
 
 	<ul>