chore(package): update jest to version 20.0.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -10,7 +10,7 @@
     "browserify": "^14.0.0",
     "eslint": "^3.18.0",
     "husky": "^0.13.2",
-    "jest": "^19.0.2",
+    "jest": "^20.0.1",
     "lint-staged": "^3.4.0",
     "prettier": "^1.0.0",
     "semantic-release": "^6.3.2"