chore(package): update @storybook/addon-actions to version 4.0.2

Closes #23

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "react": "^15.0.0 || ^16.0.0"
   },
   "devDependencies": {
-    "@storybook/addon-actions": "^3.2.14",
+    "@storybook/addon-actions": "^4.0.2",
     "@storybook/addon-links": "^3.2.14",
     "@storybook/react": "^3.2.14",
     "@types/react": "^16.0.38",