Update README.md

[mtcolman]

Should have been updated as part of #432

Changes

Minor change to reflect that nonroot SCC is now used, whereas it said anyuid

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Release Notes

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[wlynch]

@lcarva I'm not super familiar with openshift - can you or another redhatter take a look at this ?

/ok-to-test

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[lcarva]

/lgtm

Matches the intent of #432
cc @concaf