[css-transitions-1][editorial] Added changes since October 2018 WD

Author: SebastianZ

css-transitions-1/Overview.bs

@@ -1352,14 +1352,20 @@ by overriding the transition properties.
 Changes {#changes}
 ==================
 
-Changes since Working Draft of 11 October 2018 {#changes-2018} 
+Changes since Working Draft of 11 October 2018 {#changes-2018}
 --------------------------------------------------------------
 
 The following are the substantive changes made since the
 <a href="https://www.w3.org/TR/2018/WD-css-transitions-1-20181011/">Working Draft
 dated 11 October 2018</a>:
 
-*   (Not up to date)
+* Clarified that {{GlobalEventHandlers}} is a mixin.
+* Replaced defunct <code>&lt;timing-function&gt;</code> by <<easing-function>>.
+* Added default value to {{transitionEventInitDict}} dictionary.
+* Removed trailing semicolon from <<single-transition-property>> syntax.
+* Associated event definitions with their {{GlobalEventHandlers}} container.
+* Added range definition notations to property values.
+* Minor editorial fixes and improvements.
 
 For more details on these changes, see the version control
 <a href="https://github.com/w3c/csswg-drafts/commits/main/css-transitions-1/Overview.bs">change log</a>.