chore: Add Timo to user list

[vanducng]

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[vanducng]

@liyinan926 Can you help to review it?

[zevisert]

PRs updating who-is-using can be merged to clean up the backlog of open MRs:

• Adding moengage to who-is-using #1808
• CityMall is using k8s spark operator #1795
• chore: Add Timo to user list #1615
• Update who-is-using #1449

[vara-bonthu]

/lgtm

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