[css-scroll-snap-1] Fix date in changes list. w3c#3269

Author: fantasai

css-scroll-snap-1/Overview.bs

@@ -1111,7 +1111,7 @@ Acknowledgements {#acknowledgements}
 Changes {#changes}
 ==================
 
-Changes Since 14 December 2018 CR {#changes-20180814}
+Changes Since 14 August 2018 CR {#changes-20180814}
 ---------------------------------------------------
 
 	Changes since the <a href="https://www.w3.org/TR/2018/CR-css-scroll-snap-1-20180814/">14 August 2018 Candidate Recommendation</a> include: