chore(package): update @storybook/addon-storyshots to version 4.0.3

Closes #15

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "@storybook/addon-actions": "^4.0.3",
     "@storybook/addon-links": "^4.0.3",
     "@storybook/addon-notes": "^4.0.3",
-    "@storybook/addon-storyshots": "^3.4.2",
+    "@storybook/addon-storyshots": "^4.0.3",
     "@storybook/addons": "^4.0.3",
     "@storybook/react": "^3.4.2",
     "babel-cli": "^6.26.0",