[css-text-3] Update Changes section

Author: frivoal

css-text-3/Overview.bs

@@ -4241,7 +4241,13 @@ Acknowledgements</h2>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
-  <h3 class="no-num" id="recent-changes">
+  <h3 class="no-num" id="changes-2018-12-12" oldids="recent-changes">
+  Changes from the <a href="https://www.w3.org/TR/2018/WD-css-text-3-20181212/">12 December 2018 Working Draft</a></h3>
+
+  * Clarify that ''hyphens: none'' does not suppress wrapping opportunities after U+002D or U+2010.
+  * Fix stray text leftover when removing percentages as a possible value for word-spacing.
+
+  <h3 class="no-num" id="changes-2018-12-06">
   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