chore(package): update @storybook/addon-knobs to version 5.0.11

Closes #2

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
   "devDependencies": {
     "@storybook/addon-actions": "^5.0.11",
     "@storybook/addon-centered": "^5.1.0",
-    "@storybook/addon-knobs": "^4.1.13",
+    "@storybook/addon-knobs": "^5.0.11",
     "@storybook/addon-notes": "^4.1.13",
     "@storybook/react": "^4.1.13",
     "@types/enzyme": "^3.1.18",