Update CHANGELOG.md

Author: sweetbrulee

CHANGELOG.md

@@ -22,6 +22,7 @@ These changes are available on the `master` branch, but have not yet been releas
   `tags`. ([#2520](https://github.com/Pycord-Development/pycord/pull/2520))
 - Added `Member.guild_banner` and `Member.display_banner` properties.
   ([#2556](https://github.com/Pycord-Development/pycord/pull/2556))
+- Added optional `check` parameter in `utils.basic_autocomplete`. ([#2590](https://github.com/Pycord-Development/pycord/pull/2590))
 
 ### Fixed