Update CHANGELOG.md

extensions/debug/CHANGELOG.md

@@ -6,6 +6,7 @@ Yii Framework 2 debug extension Change Log
 
 - Bug #1263: Fixed the issue that Gii and Debug modules might be affected by incompatible asset manager configuration (qiangxue)
 - Bug #3956: Debug toolbar was affecting flash message removal (samdark) 
+- Bug #4031: Http status codes were hardcoded in filter (sdkiller)
 - Enh #2299: Date and time in request list is now never wrapped (samdark)
 - Enh #3088: The debug module will manage their own URL rules now (qiangxue)
 - Enh #3103: debugger panel is now not displayed when printing a page (githubjeka)