Merge branch 'update-changelog' into 'master'

[DOC][SDK] v3.13.1

See merge request codingame/game-engine!272

Author: CG-Kimi

playground/misc/misc-3-release-notes.md

@@ -2,7 +2,7 @@
 
 The CodinGame SDK is regularly updated and improved. This document lets you know what changed in the latest releases.
 
-## Next Release
+## 3.13.1
 
 ### 🐞 Bug fix