chore(package): update jest to version 22.0.5

Closes #4

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "graphql": "^0.11.7",
     "graphql-tools": "^2.5.1",
     "husky": "^0.14.3",
-    "jest": "^21.2.1",
+    "jest": "^22.0.5",
     "nodemon": "^1.11.0",
     "prettier": "^1.5.3",
     "semantic-release": "^8.2.0"