Remove ellenkorbes

[cblecker]

{"client":"github","component":"peribolos","file":"external/io_k8s_test_infra/prow/github/client.go:522","func":"k8s.io/test-infra/prow/github.(*client).log","level":"info","msg":"UpdateOrgMembership(kubernetes, ellenkorbes, false)","time":"2019-11-15T21:30:56Z"}

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker

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• config/kubernetes/OWNERS [cblecker]

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[mrbobbytables]

/lgtm

[l-korbes]

Hi, I believe the reason this happened is that I changed my username from "ellenkorbes" to "l-korbes". The old name has been removed; can we add the new name? Thanks! @cblecker @mrbobbytables