Bump jest-config from 24.8.0 to 24.9.0

Bumps [jest-config](https://github.com/facebook/jest/tree/HEAD/packages/jest-config) from 24.8.0 to 24.9.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/jest/commits/v24.9.0/packages/jest-config)

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