Added a badge.

Author: prwater

README.md

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 # Exceptions with format string
 
+[![Dependency Status](https://www.versioneye.com/user/projects/571143d0fcd19a00518559f0/badge.svg?style=flat)](https://www.versioneye.com/user/projects/571143d0fcd19a00518559f0)
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 This package provides exceptions with messages according a format string like 
 [sprintf](http://php.net/manual/en/function.sprintf.php).