chore(package): update @storybook/addon-storyshots to version 5.1.5

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "@storybook/addon-actions": "5.1.6",
     "@storybook/addon-knobs": "5.1.5",
     "@storybook/addon-links": "5.1.6",
-    "@storybook/addon-storyshots": "5.1.1",
+    "@storybook/addon-storyshots": "5.1.5",
     "@storybook/addons": "5.1.1",
     "@storybook/react": "5.1.1",
     "babel-eslint": "10.0.1",