message: ci: update release notes template to reflect latest releases
  changes installation instruction to using Helm chart.
  uses hidden indicator for Summary since we don't use that heading in
  the release notes.
diff: -## Summary
  +<!-- ADD SUMMARY HERE -->
  ## Installation
  -To install this release, download the client binary for your operating system:
  +To install this release, ensure you add the [Bitnami charts repository](https://github.com/bitnami/charts) to your local Helm cache:
  -Linux:
  ```
  -sudo curl -L https://github.com/kubeapps/installer/releases/download/<<TAG>>/kubeapps-linux-amd64 -o /usr/local/bin/kubeapps && sudo chmod +x /usr/local/bin/kubeapps
  +helm repo add bitnami https://charts.bitnami.com/bitnami
  +helm repo update
  ```
  -OS X:
  +Install the Kubeapps Helm chart:
  +
  ```
  -sudo curl -L https://github.com/kubeapps/installer/releases/download/<<TAG>>/kubeapps-darwin-amd64 -o /usr/local/bin/kubeapps && sudo chmod +x /usr/local/bin/kubeapps
  +helm install --name kubeapps --namespace kubeapps bitnami/kubeapps
  ```
  -To get started with Kubeapps, checkout this [walkthrough](https://github.com/kubeapps/kubeapps/blob/master/docs/getting-started.md).
  +To get started with Kubeapps, checkout this [walkthrough](https://github.com/kubeapps/kubeapps/blob/master/docs/user/getting-started.md).
  ## Changelog
  