chore(package): update @storybook/addon-knobs to version 5.0.1

Closes #2

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
   "devDependencies": {
     "@storybook/addon-actions": "^5.0.1",
     "@storybook/addon-centered": "^5.0.1",
-    "@storybook/addon-knobs": "^4.1.11",
+    "@storybook/addon-knobs": "^5.0.1",
     "@storybook/addon-notes": "^4.1.11",
     "@storybook/react": "^4.1.11",
     "@types/react": "^16.8.1",