This update for helm to version 2.13.1 fixes the following issues:

- set correct git_commit value so that 'helm version' reports correctly
- added service file for helm-serve
- Require golang 1.10.6  or newer
- Tiller should only enforce what we expect from Helm
- Keepalive config should be independent of TLS
- Bump client side grpc max msg size
- Update deprecated grpc dial timeout
- Includes fixes which allow Helm to correctly recognize
  resources created using the K8S 1.8/1.9 API namespaces