chore(package): update jest to version 22.1.0

Closes #8

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "eslint": "^4.4.1",
     "eslint-config-prettier": "^2.3.0",
     "husky": "^0.14.3",
-    "jest": "^21.0.0",
+    "jest": "^22.1.0",
     "lint-staged": "^4.0.3",
     "prettier": "^1.5.3"
   },