feat(pixels): add my new pixel

[brianmyburgh]

Checklist

• [ x] I ran npm test locally and it passed without errors.
• [ x] I only edited the _data/pixels.json file.
• [ x] I entered the username in the pixels.json that I'm also using to create this pull request.
• [ x] I acknowledge that all my contributions will be made under the project's license.

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[welcome]

Congratulations to your first contribution to the Open Pixel Art project!
If you are on the look out for more ways to contribute to open-source, check out a list of some of our repositories at https://github.com/twilio/opensource.
And if you love Twilio as much as we do, make sure to check out our Twilio Champions program! https://www.twilio.com/champions