promote stmcginnis to reviwer

[BenTheElder]

Sean has been doing a lot of review and support work for some time now, we spoke and I'm proposing him as an official reviewer.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder

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[aojea]

+1

[aojea]

/lgtm

Thanks for all the hard work Sean

[stmcginnis]

Thanks everyone - glad to be able to help! 🎉

[dims]

thanks @stmcginnis !