[css-text-3] Update changes for publication.

Author: fantasai

css-text-3/Overview.bs

@@ -7,6 +7,7 @@ Work Status: Refining
 Group: csswg
 ED: https://drafts.csswg.org/css-text-3/
 TR: https://www.w3.org/TR/css-text-3/
+Previous Version: https://www.w3.org/TR/2018/WD-css-text-3-20181206/
 Previous Version: https://www.w3.org/TR/2018/WD-css-text-3-20180920/
 Previous Version: https://www.w3.org/TR/2017/WD-css-text-3-20170822/
 Previous Version: https://www.w3.org/TR/2013/WD-css-text-3-20131010/
@@ -3173,13 +3174,22 @@ Acknowledgements</h2>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
-  ISSUE: THIS CHANGES LIST IS WAY INCOMPLETE PLEASE SEE
-  <a href="https://drafts.csswg.org/css-text-3/issues-lc-2013">Disposition of Comments</a>.
-
   <h3 class="no-num" id="recent-changes">
+  Changes from the <a href="https://www.w3.org/TR/2018/WD-css-text-3-20181206/">6 December 2018 Working Draft</a></h3>
+
+  Changes between 6 December 2018 and 12 December 2018 consist of
+  some minor cleanup in the line breaking section
+  and deferring <<percentage>> values of 'word-spacing' to Level 4
+  with the expectation that they will be redefined
+  (see discussion in <a href="https://github.com/w3c/csswg-drafts/issues/2165">issue 2165</a>).
+
+  <h3 class="no-num" id="changes-2013">
   Changes from the <a href="https://www.w3.org/TR/2013/WD-css-text-3-20131010/">October
   2013 CSS3 Text <abbr title="Last Call Working Draft">LCWD</abbr></a></h3>
 
+  ISSUE: THIS CHANGES LIST IS WAY INCOMPLETE PLEASE SEE
+  <a href="https://drafts.csswg.org/css-text-3/issues-lc-2013">Disposition of Comments</a>.
+
   <ul>
     <li>Switched 'tab-size' to use <<number>> so that it is animatable,
         and defined it to also account for 'letter-spacing' and 'word-spacing'.