chore(package): update jest to version 20.0.1 (#9)

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "babel-preset-es2015": "^6.18.0",
     "babel-preset-stage-0": "^6.16.0",
     "coveralls": "^2.11.15",
-    "jest": "^19.0.2",
+    "jest": "^20.0.1",
     "jest-each": "0.2.0"
   },
   "babel": {