Promote Warre to Maintainer (#1941)

Author: serkan-ozal

README.md

@@ -128,13 +128,13 @@ See the [Contributing Guide](CONTRIBUTING.md) for details.
 
 - [Serkan Özal](https://github.com/serkan-ozal), Catchpoint
 - [Tyler Benson](https://github.com/tylerbenson), ServiceNow
+- [Warre Pessers](https://github.com/wpessers)
 
 For more information about the maintainer role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#maintainer).
 
 ### Approvers
 
 - [Ivan Santos](https://github.com/pragmaticivan)
-- [Warre Pessers](https://github.com/wpessers)
 
 For more information about the approver role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#approver).