Add @neoziro as a contributor

[kentcdodds]

He influenced the library in a huge way early on: testing-library/react-testing-library#16

[kentcdodds]

@all-contributors please add @neoziro for ideas

[allcontributors]

@kentcdodds

I've put up a pull request to add @neoziro! 🎉

[kentcdodds]

For real @neoziro, I'm not sure how I forgot to add you, but it's a real shame. Thank you so much!