Update windows command in README to allow windows to be build alone locally

[mcshooter]

No description provided.

[k8s-ci-robot]

Hi @mcshooter. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mcshooter]

/cc @jeremyje

[jeremyje]

/lgtm
/approval

[Random-Liu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jeremyje, mcshooter, Random-Liu

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