update changes

Author: svgeesus

css-masking-1/Overview.bs

@@ -1437,6 +1437,9 @@ interface SVGMaskElement : SVGElement {
 
 <h2 class="no-num" id="changes">Changes since last publication</h2>
 
+The following changes were made since the <a href="https://www.w3.org/TR/2021/CRD-css-masking-1-20210805/">5 August 2021 Candidate Recommendation Draft</a>.
+* Added a privacy concern regarding hiding sensitive content
+
 The following changes were made since the <a href="https://www.w3.org/TR/2014/CR-css-masking-1-20140826/">26 August 2014 Candidate Recommendation</a>.
 * Allowed the <<'mask-mode'>> value in the 'mask' shorthand to appear anywhere other than between <<'mask-position'>> and <<'mask-size'>>.
 * Removed Implements SVGUnitTypes on clipPath and mask elements.