update changelog

CHANGELOG.md

@@ -5,6 +5,8 @@
 - Remove automatic announcements from some admin commands
 - Send no reply to unauthorized admin commands
 - Fix swapped `/opengroup` and `/closegroup` descriptions in help
+- Add `/optout` and `/optin`
+- Add `#nobot` checking when using the `/boost` command
 
 ## v0.2.6
 - Allow boosting group hashtags when they are in a reply, except when it is private/DM