Add Tyler Helmuth as an approver (#152)

Tyler has been actively involved in this repo recently. The following PR were submitted or reviewed:
- #129
- #131
- #139
- #147
- #151
- #142
- #143
- #148

cc @open-telemetry/helm-approvers

README.md

@@ -33,6 +33,7 @@ See [CONTRIBUTING.md](./CONTRIBUTING.md).
 Approvers ([@open-telemetry/helm-approvers](https://github.com/orgs/open-telemetry/teams/helm-approvers)):
 
 - [Naseem K. Ullah](https://github.com/naseemkullah), Transit
+- [Tyler Helmuth](https://github.com/TylerHelmuth), New Relic
 
 Maintainers ([@open-telemetry/helm-maintainers](https://github.com/orgs/open-telemetry/teams/helm-maintainers)):