Update big number thumbnail in selection panel <img width="290" alt="screen shot 2018-08-30 at 1 20 29 pm" src="https://user-images.githubusercontent.com/27827808/44877007-7f240780-ac57-11e8-8af8-6f3cc5722591.png";>
@kristw @williaster [ Full content available at: https://github.com/apache/incubator-superset/pull/5782 ] This message was relayed via gitbox.apache.org for [email protected]
![https://user-images.githubusercontent.com/27827808/44877007-7f240780-ac57-11e8-8af8-6f3cc5722591.png"](https://user-images.githubusercontent.com/27827808/44877007-7f240780-ac57-11e8-8af8-6f3cc5722591.png"){kind=link}