Update CHANGELOG.md

CHANGELOG.md

@@ -41,6 +41,7 @@ You should also include the user name that made the change.
 - Server: delete outdated notifications regularly to improve db performance @syuilo
 - Server: delete outdated hard-mutes regularly to improve db performance @syuilo
 - Server: delete outdated notes of antenna regularly to improve db performance @syuilo
+- Server: improve activitypub deliver performance @syuilo
 - Client: use tabler-icons instead of fontawesome to better design @syuilo
 - Client: Add new gabber kick sounds (thanks for noizenecio)
 - Client: Add link to user RSS feed in profile menu @ssmucny