Adding matzew to OWNERS

[matzew]

From ROLES.md

Reviewer of the codebase for at least 3 months.

First review: October 2018

• using cloud events for the sample heartbeat #27

Primary reviewer for at least 10 substantial PRs to the codebase.

21 PRs:
https://github.com/knative/eventing-contrib/pulls?utf8=%E2%9C%93&q=is%3Apr+-author%3Amatzew+reviewed-by%3Amatzew+-label%3Asize%2FS+-label%3Asize%2FXS+-label%3Asize%2FM

Examples:

• Add Websocket ContainerSource. #138
• Kafka Event Source #264
• Issue #364 Add Support to Kafka Source for Resource spec #399
• Upgrade Camel Sources to use Camel K 0.3.3 and add complex integrations #403
• Refactored Kafka src and ch code to reuse same consumer group handler code #554

Reviewed or merged at least 30 PRs to the codebase.

Reviewed 41 PRs
https://github.com/knative/eventing-contrib/pulls?utf8=%E2%9C%93&q=is%3Apr+reviewed-by%3Amatzew

Merged 33 PRs
https://github.com/knative/eventing-contrib/pulls?utf8=%E2%9C%93&q=is%3Apr+author%3Amatzew+is%3Amerged+

Nominated by an area lead with no objections from other leads

@vaikas-google

[n3wscott]

/lgtm

[mattmoor]

/lgtm

[vaikas]

/lgtm

[n3wscott]

/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, n3wscott

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• OWNERS [n3wscott]

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