Update Helm to v2.16.1 (#546)
Update Helm to v2.16.1 (#546)

This is required to run on Kubernetes 1.16 (see
https://github.com/istio/istio/issues/16632).

I have manually verified this works for Istio, and a diff of `helm
template` from older versions to newer versions shows no difference.
istio/tools,istio/tools,istio/tools,istio/tools,istio/tools,istio/tools