chore: update maintainers/reviewers

[ivankatliarchuk]

Description

add @ivankatliarchuk to list of maintaners/reviewers

Checklist

• Unit tests updated
• End user documentation updated

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[mloiseleur]

Thanks @ivankatliarchuk for all your recent contributions on external-dns

The official guide says about requirements for reviewer:

• Primary reviewer for at least 5 PRs to the codebase
• Reviewed or merged at least 20 substantial PRs to the codebase

We are half the way here, so let's just wait a bit longer. You can already lgtm PR, so there is no need to rush.

[ivankatliarchuk]

Yeah, I get that. Actually added a proposal to update this document ;-) kubernetes/community#8292

[ivankatliarchuk]

And this one cncf/devstats#91