Adding a new maintainer

The Linkerd maintainers are:

• Oliver Gould [email protected] @olix0r (super-maintainer)
• Alex Leong [email protected] @adleong (super-maintainer)
• Zarahi Dichev [email protected] @zaharidichev (super-maintainer)
• Risha Mars [email protected] @rmars: Admin UI
• William Morgan [email protected] @wmorgan: docs and governance
• Adam Christian [email protected] @admc: docs and governance
• Borys Pierov [email protected] @Ashald: Consul integration
• Zack Angelo [email protected] @zackangelo: H2 codec
• Christopher Taylor [email protected] @ccmtaylor: DNS SRV namer

<!-- # Adding a new maintainer * Submit a PR modifying this file * Add maintainer to .github/CODEOWNERS * Obtain approvals per GOVERNANCE.md * Invite maintainer to https://github.com/orgs/linkerd/teams/linkerd-maintainers/members * Invite maintainer to https://github.com/orgs/linkerd/people -->