Update README.md

[soupdiver]

fix typo

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[soupdiver]

I signed it!

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Labelling this PR as size/XS

[davidopp]

LGTM

I'm not sure this is a typo--sometimes people like to use "iff" to be especially clear they mean "if and only if." But the normal colloquial interpretation of "if" is already "if and only if" anyway, so I think this is fine to change.

[k8s-github-robot]

@k8s-bot ok to test
@k8s-bot test this

pr builder appears to be missing, activating due to 'lgtm' label.

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GCE e2e test build/test passed for commit be73018.

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[soupdiver]

@davidopp ah okay... I wasn't aware of the "if and only if" saying. Feel free to decide it that's a relevant PR or not :)

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@k8s-bot test this

Tests are more than 48 hours old. Re-running tests.

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GCE e2e build/test failed for commit be73018.

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