Update README.md to mention OpenShift SCC

[pdmack]

Prescriptive fix for deploying the ambassador and jupyter-hub components in OpenShift

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[pdmack]

I signed it!

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CLAs look good, thanks!

[jlewi]

/ok-to-test

[jlewi]

@pdmack sent you an invitation to the Kubeflow org so that you will be able to trigger tests.