Update README.md

Author: sidorares

README.md

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 # About
 Mysql client module for node.js, written in JavaScript. No other mysql runtime required.
 
+[![Build Status](https://secure.travis-ci.org/sidorares/nodejs-mysql-native.png)](http://travis-ci.org/sidorares/nodejs-mysql-native)
+
 # Install
 `npm install mysql-native`