Update changelog

Author: Taaku18

CHANGELOG.md

@@ -14,6 +14,7 @@ however, insignificant breaking changes do not guarantee a major version bump, s
 - Reply not being forwarded from DM. (PR [#3239](https://github.com/modmail-dev/modmail/pull/3239))
 - Cleanup imports after removing/unloading a plugin. ([PR #3226](https://github.com/modmail-dev/Modmail/pull/3226))
 - Fixed a syntactic error in the close message when a thread is closed after a certain duration. ([PR #3233](https://github.com/modmail-dev/Modmail/pull/3233))
+- Removed an extra space in the help command title when the command has no parameters. ([PR #3271](https://github.com/modmail-dev/Modmail/pull/3271))
 
 ### Added
 - `?log key <key>` to retrieve the log link and view a preview using a log key. ([PR #3196](https://github.com/modmail-dev/Modmail/pull/3196))