chore(package): update babel-preset-react-app to version 5.0.3

Closes #150

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
     "babel-core": "^6.7.4",
     "babel-eslint": "8.2.2",
     "babel-loader": "^7.0.0",
-    "babel-preset-react-app": "^3.1.0",
+    "babel-preset-react-app": "^5.0.3",
     "babel-register": "^6.7.2",
     "codecov": "^3.0.0",
     "enzyme": "^3.1.0",