Update react requirement from ^0.12.2 to ^16.7.0
Update react requirement from ^0.12.2 to ^16.7.0

Updates the requirements on [react](https://github.com/facebook/react) to permit the latest version.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v16.7.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
fengtingzhang/heroku-node-react,fengtingzhang/heroku-node-react