fix(engine): Add change log

CG-Kimi · CG-Kimi · commit 3d79eeb06733 · 2020-04-07T16:38:49.000+02:00
diff --git a/playground/misc/misc-3-release-notes.md b/playground/misc/misc-3-release-notes.md
@@ -7,6 +7,7 @@ The CodinGame SDK is regularly updated and improved. This document lets you know
 ### 🐞 Bug fix
 
 - Fixed CSS issues in statement editor preview
+- Fixed message boxes when a player tries to write $2, $3...
 
 ## 3.13.0
 
