include release notes

Author: Julien

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

@@ -8,6 +8,7 @@ The CodinGame SDK is regularly updated and improved. This document lets you know
 
 - Improved display of player output in local test page.
 - Better handling of errors from initializing modules
+- Unused `title` property no longer mandatory in `config.ini`
 
 ## 3.3.1