build(deps-dev): bump jest from 22.4.3 to 23.6.0

Bumps [jest](https://github.com/facebook/jest) from 22.4.3 to 23.6.0.
- [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/v23.6.0)

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

Author: dependabot-support

package.json

@@ -41,7 +41,7 @@
     "danger": "^3.5.1",
     "danger-plugin-digitalcitizenship": "^0.3.1",
     "io-ts": "^1.1.4",
-    "jest": "^22.4.3",
+    "jest": "^23.6.0",
     "rimraf": "^2.6.2",
     "ts-jest": "^22.4.5",
     "ts-node": "^6.1.0",