Bump @testing-library/react from 10.4.1 to 10.4.3 (#187)

Bumps [@testing-library/react](https://github.com/testing-library/react-testing-library) from 10.4.1 to 10.4.3.
- [Release notes](https://github.com/testing-library/react-testing-library/releases)
- [Changelog](https://github.com/testing-library/react-testing-library/blob/master/CHANGELOG.md)
- [Commits](testing-library/react-testing-library@v10.4.1...v10.4.3)

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