chore(package): update @storybook/react to version 4.0.7

Closes #599

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
     "wkn": "^1.0.4"
   },
   "devDependencies": {
-    "@storybook/react": "^3.4.11",
+    "@storybook/react": "^4.0.7",
     "chai": "^4.2.0",
     "eslint-config-airbnb": "^17.1.0",
     "eslint-plugin-import": "^2.14.0",