add CDNJS version badge in README.md

This badge will show the version on CDNJS.
Chyren0305 · Dec 22, 2016 · a523616 · a523616
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diff --git a/README.md b/README.md
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 # cropit
+[![CDNJS](https://img.shields.io/cdnjs/v/cropit.svg)](https://cdnjs.com/libraries/cropit)
 
 Customizable crop and zoom.