added paypal button

README.md

@@ -21,6 +21,8 @@ Example of obfuscated code: [gist.github.com](https://gist.github.com/sanex3339/
 * Gulp: [gulp-javascript-obfuscator](https://github.com/javascript-obfuscator/gulp-javascript-obfuscator)
 * Grunt: [grunt-contrib-obfuscator](https://github.com/javascript-obfuscator/grunt-contrib-obfuscator)
 
+[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=6SDRM5JRMGH9Y)
+
 [![npm version](https://badge.fury.io/js/javascript-obfuscator.svg)](https://badge.fury.io/js/javascript-obfuscator)
 [![Build Status](https://travis-ci.org/javascript-obfuscator/javascript-obfuscator.svg?branch=master)](https://travis-ci.org/javascript-obfuscator/javascript-obfuscator)
 [![Coverage Status](https://coveralls.io/repos/github/javascript-obfuscator/javascript-obfuscator/badge.svg?branch=master)](https://coveralls.io/github/javascript-obfuscator/javascript-obfuscator?branch=master)