Fix typo in README

[openshift-ci[bot]]

Hi @AlbertoPimpo. Thanks for your PR.

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[mateusoliveira43]

/ok-to-test

[openshift-ci[bot]]

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[mateusoliveira43]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlbertoPimpo, mateusoliveira43, sseago

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/openshift-velero-plugin/blob/master/OWNERS)~~ [sseago] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment