Add a Bitdeli badge to README

README.md

@@ -42,3 +42,7 @@ License
 -------
 
 This bundle is available under the [MIT license](Resources/meta/LICENSE).
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+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/sonata-project/sonataadminbundle/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
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