chore(package): update jest to version 22.0.1

[aszecsei]

Closes #13

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[coveralls]

Coverage remained the same at 100.0% when pulling 510c59a0865b8306d4f87f976d4e8af258b80d2a on greenkeeper/jest-22.0.1 into e1f5ab4b3d836f6735471cea17a44dbe8d32241a on master.