chore(package): update jest to version 22.0.0 (#33)

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "eslint-plugin-react": "^7.4.0",
     "eslint-plugin-react-native": "^3.1.0",
     "flow-bin": "^0.61.0",
-    "jest": "^21.2.0",
+    "jest": "^22.0.0",
     "prettier": "^1.7.0",
     "prettier-eslint": "^8.2.1",
     "react-test-renderer": "16.2.0"