Merge pull request #58 from graphcool/greenkeeper/jest-22.0.0

Update jest to the latest version 🚀

Author: schickling

package.json

@@ -29,7 +29,7 @@
     "@types/fs-extra": "4.0.5",
     "@types/jest": "^21.1.1",
     "@types/lodash": "^4.14.62",
-    "jest": "^21.2.1",
+    "jest": "^22.0.0",
     "mock-fs": "^4.3.0",
     "ts-jest": "^22.0.0",
     "tslint": "^5.1.0"