chore(package): update @storybook/react to version 4.0.1

Closes #25

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
   "devDependencies": {
     "@commitlint/cli": "6.1.3",
     "@commitlint/config-conventional": "6.1.3",
-    "@storybook/react": "3.4.0",
+    "@storybook/react": "4.0.1",
     "babel-cli": "6.26.0",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-react": "6.24.1",