chore(package): update jest to version 21.0.1

Closes #3067

Author: greenkeeper[bot]

package.json

@@ -243,7 +243,7 @@
     "http-proxy": "^1.16.2",
     "intl": "^1.2.5",
     "intl-locales-supported": "^1.0.0",
-    "jest": "^20.0.3",
+    "jest": "^21.0.1",
     "jest-enzyme": "^3.2.0",
     "json-loader": "^0.5.4",
     "mock-express-request": "^0.2.0",