chore(package): update babel-jest to version 20.0.0 (#8)

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
   "devDependencies": {
     "babel-cli": "^6.18.0",
     "babel-core": "^6.18.2",
-    "babel-jest": "^19.0.0",
+    "babel-jest": "^20.0.0",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-es2015-modules-umd": "^6.23.0",
     "babel-preset-es2015": "^6.18.0",