chore(package): update @storybook/react to version 4.0.4

Closes #23

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
   "devDependencies": {
     "@storybook/addon-actions": "^4.0.4",
     "@storybook/addon-links": "^4.0.4",
-    "@storybook/react": "^3.2.14",
+    "@storybook/react": "^4.0.4",
     "@types/react": "^16.0.38",
     "babel-cli": "^6.24.1",
     "babel-core": "^6.25.0",