Bump jest from 23.5.0 to 23.6.0

Bumps [jest](https://github.com/facebook/jest) from 23.5.0 to 23.6.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](jestjs/jest@v23.5.0...v23.6.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support