Update README.md

Author: dinhquochan

README.md

@@ -54,7 +54,7 @@ Please see [CONTRIBUTING](CONTRIBUTING.md) for details.
 
 ### Security
 
-If you discover any security related issues, please email contact@dinhquochan.com instead of using the issue tracker.
+If you discover any security related issues, please email minhsang2603@gmail.com instead of using the issue tracker.
 
 ## Credits