chore(package): update storybook-readme to version 4.0.1

Closes #21

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "postcss-nested": "^3.0.0",
     "raw-loader": "^0.5.1",
     "react-dom": "^15.6.1",
-    "storybook-readme": "^3.0.5",
+    "storybook-readme": "^4.0.1",
     "style-loader": "^0.19.0",
     "webpack": "^3.3.0",
     "webpack-node-externals": "^1.6.0"