read from stdin

[duncan485]

What type of PR is this?

feature

What this PR does / why we need it:

Allow reading from stdin , using "-" (just like kubectl apply -f -). This also providers the ability to use templating engines and directly pipe their input to kubectl-validate. For example kustomize build overlays/dev | kubectl validate - .

Which issue(s) this PR fixes:

Fixes #32

Special notes for your reviewer:

First contribution, please let me know if I'm in the right direction with this solution. I know it at least needs some documentation, but wanted to get some feedback first.

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

• ✅login: duncan485 / (7bec888)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: duncan485
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