Update README.md

Author: codingo

README.md

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 NoSQLMap 
 ========
 [![Python 2.6|2.7](https://img.shields.io/badge/python-2.6|2.7-yellow.svg)](https://www.python.org/) 
-[![License](https://img.shields.io/badge/license-GPLv2-red.svg)](https://github.com/codingo/NoSQLMap/blob/master/COPYING)
+[![License](https://img.shields.io/badge/license-GPLv3-red.svg)](https://github.com/codingo/NoSQLMap/blob/master/COPYING)
 [![Twitter](https://img.shields.io/badge/twitter-@codingo__-blue.svg)](https://twitter.com/codingo_)
 
 NoSQLMap is an open source Python tool designed to audit for as well as automate injection attacks and exploit default configuration weaknesses in NoSQL databases and web applications using NoSQL in order to disclose or clone data from the database.