Add @tk2217

[tk2217]

Checklist

• I ran npm test locally and it passed without errors.

• I only edited the _data/pixels.json file.

• I entered the username in the pixels.json that I'm also using to create this pull request.
• I acknowledge that all my contributions will be made under the project's license.

[mergify]

Unfortunately the automatic code review has failed. Please click the details button for more information. If the details reveal a fail in Danger please note that there is currently a known issue (#2046) and @dkundel will merge your PR manually in the coming days. Sorry for the inconvenience.

[welcome]

Congratulations on 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!