kubernetes v1.13 support

The dependency `gopkg.in/yaml.v2` had to be upgraded which changed some
output formatting.  The golden files for the tests are included.

Signed-off-by: Adam Reese <adam@reese.io>

This is described in the official Helm 3 proposal: https://github.com/helm/community/blob/master/helm-v3/000-helm-v3.md



Signed-off-by: Matt Butcher <matt.butcher@microsoft.com>

Signed-off-by: Adam Reese <adam@reese.io>