chore(package): update @storybook/react to version 4.0.3

Closes #15

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "@storybook/addon-notes": "^4.0.3",
     "@storybook/addon-storyshots": "^4.0.3",
     "@storybook/addons": "^4.0.3",
-    "@storybook/react": "^3.4.2",
+    "@storybook/react": "^4.0.3",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.0",
     "babel-jest": "^23.0.1",