Error Reports can be much more specific

I have a yaml file containing configurations for multiple Kubernetes resources

when i run kubeval

I get a one line report!:

```* Missing a kind key```

and it does not specify where in file the error has occured

Start by reproducing the report with a YAML file containing multiple Kubernetes resources and a resource missing its kind key. Trace how kubeval formats validation errors; done means the output identifies where the error occurred instead of reporting only that a kind key is missing.

Written by the indexing model from the issue text.