chore(package): update babel-jest to version 21.0.2

Closes #14

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "babel-cli": "^6.24.1",
     "babel-core": "^6.25.0",
     "babel-eslint": "^7.2.3",
-    "babel-jest": "^20.0.3",
+    "babel-jest": "^21.0.2",
     "babel-loader": "^7.0.0",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-es2015-modules-commonjs": "^6.24.1",