Update CHANGELOG.md

Author: Lumabots

CHANGELOG.md

@@ -138,6 +138,8 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#2843](https://github.com/Pycord-Development/pycord/pull/2843))
 - Fixed `TypeError` when using `@option` with certain annotations and along with
   `channel_types`. ([#2835](https://github.com/Pycord-Development/pycord/pull/2835))
+- Fixed `TypeError` when using `Optional[...]` or `... | None` in command option type.
+([#2852](https://github.com/Pycord-Development/pycord/pull/2852))
 
 ### Changed