Add 2.13.12 upgrade, add overall speedup numbers

Author: gzm0

_posts/news/2023-09-30-announcing-scalajs.1.14.0.md

@@ -8,8 +8,8 @@ permalink: /news/2023/09/30/announcing-scalajs-1.14.0/
 
 We are pleased to announce the release of Scala.js 1.14.0!
 
-This release mainly brings speed improvements in the reachability analysis by parallizing it.
-TODO Mention 2.13.12 upgrade.
+This release mainly brings speed improvements in the reachability analysis by parallelizing it.
+It also upgrades the Scala 2.13.x standard library to version 2.13.12.
 
 Read on for more details.
 
@@ -39,7 +39,8 @@ As a reminder, libraries compiled with 0.6.x cannot be used with Scala.js 1.x; t
 
 ### Reachability Analysis is parallel by default
 
-We have observed up to 2x speedup of reachability analysis on the Scala.js test suite with this change.
+We have observed up to 2x speedup of reachability analysis (20% speedup overall)
+on the Scala.js test suite with this change.
 
 In case you encounter issues, you can disable the new behavior by setting: