Removed draino from README

[guettli]

The draino project was not updated for 5 years.

[k8s-ci-robot]

Hi @guettli. Thanks for your PR.

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[hakman]

Thanks @guettli. This was coming for a long time now. I think many people still use various Draino forks, but there's no commitment to reviving it these days.
/lgtm
/assign @wangzhen127

[hakman]

/ok-to-test

[kundan2707]

it should be removed as no updates since long time

[kundan2707]

/lgtm

[wangzhen127]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guettli, hakman, kundan2707, wangzhen127

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