fix: remove storybook dependency (#3)

* fix: remove storybook dependency

* fix: update node

superset-frontend/temporary_superset_ui/superset-ui-plugins-deckgl/.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 
 node_js:
-  - '10.10'
+  - '10.15'
 
 cache:
   - npm: true

superset-frontend/temporary_superset_ui/superset-ui-plugins-deckgl/packages/superset-ui-plugins-demo/package.json

@@ -38,7 +38,6 @@
     "@storybook/addons": "^5.0.9",
     "@storybook/react": "^5.0.9",
     "@types/react": "^16.8.8",
-    "@types/storybook__addon-knobs": "^5.0.0",
     "@types/storybook__react": "3.0.7",
     "bootstrap": "^4.3.1",
     "react": "^16.6.0",