Update related.md

Add helm-gcs plugin

docs/related.md

@@ -36,6 +36,7 @@ or [pull request](https://github.com/kubernetes/helm/pulls).
 - [App Registry](https://github.com/app-registry/helm-plugin) - Plugin to manage charts via the [App Registry specification](https://github.com/app-registry/spec)
 - [helm-secrets](https://github.com/futuresimple/helm-secrets) - Plugin to manage and store secrets safely
 - [helm-edit](https://github.com/mstrzele/helm-edit) - Plugin for editing release's values
+- [helm-gcs](https://github.com/nouney/helm-gcs) - Plugin to manage repositories on Google Cloud Storage
 
 We also encourage GitHub authors to use the [helm-plugin](https://github.com/search?q=topic%3Ahelm-plugin&type=Repositories)
 tag on their plugin repositories.