chore(package): update jest to version 22.0.1

Closes #18

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "chai": "^3.5.0",
     "doctoc": "^1.3.0",
     "husky": "^0.13.2",
-    "jest": "^19.0.2",
+    "jest": "^22.0.1",
     "nodemon": "^1.11.0",
     "prettier": "^1.0.0",
     "semistandard": "^11.0.0"