[css-color-5] update changes

Author: svgeesus

css-color-5/Overview.bs

@@ -929,6 +929,24 @@ Changes {#changes}
 <h3 id="changes-20200303">Since the <a href="https://www.w3.org/TR/2020/WD-css-color-5-20200303/">FPWD of 10 June 2020</a></h3>
 
 <ul>
+	<!-- to 5 Jan 2021 -->
+	<li>Link to CSS 4 definition of color serialization</li>
+	<li>Define premultiplied alpha interpolation</li>
+	<li>Start to address interpolation to and from currentColor</li>
+	<li>Define hue interpolation with NaN</li>
+	<li>Generalize color interpolation</li>
+	<li>Define interpolation to be in Lab, with override to LCG</li>
+	<li>Added separate section for colorspaces</li>
+	<li>Updated color-adjust example</li>
+	<li>Added explanatory diagrams</li>
+	<li>Deal with unresolved percentages</li>
+	<li>Normalize arguments to color-mix</li>
+	<li>Allow percentages for adjusters</li>
+	<li>Link fixes</li>
+	<li>Updated color-mix grammar, allowing adjusters, add alpha adjuster</li>
+	<li>Corrections to hue interpolation</li>
+	<li>Corrections to some examples</li>
+	<li>Updated Security and Privacy section</li>
 	<!-- to 11 June 2020 -->
 	<li>added interpolation section</li>
 	<li>defined hue angle interpolation</li>