Add a Bitdeli badge to README

README.md

@@ -79,3 +79,7 @@ grunt build
 ```
 
 Result will appear in `dist` directory.
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+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/wenzhixin/bootstrap-table/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
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