Update company affiliation for jack-berg

Author: jack-berg

README.md

@@ -54,7 +54,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ### Maintainers
 
-- [Jack Berg](https://github.com/jack-berg), New Relic
+- [Jack Berg](https://github.com/jack-berg), Grafana
 - [Jason Plumb](https://github.com/breedx-splk), Splunk
 - [Lauri Tulmin](https://github.com/laurit), Splunk
 - [Trask Stalnaker](https://github.com/trask), Microsoft