Update company affiliation for jack-berg

Author: jack-berg

README.md

@@ -257,7 +257,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for:
 
 ### Maintainers
 
-- [Jack Berg](https://github.com/jack-berg), New Relic
+- [Jack Berg](https://github.com/jack-berg), Grafana
 - [John Watson](https://github.com/jkwatson), Verta.ai
 
 For more information about the maintainer role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#maintainer).