Update README.md

[krazyhaas]

Fix typo

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This change is 

[k8s-ci-robot]

Hi @krazyhaas. Thanks for your PR.

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[neuromage]

/lgtm
/approve

[vicaire]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: neuromage, vicaire

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