Update README.md

Author: freekmurze

README.md

@@ -68,7 +68,7 @@ Please see [CONTRIBUTING](CONTRIBUTING.md) for details.
 
 ### Security
 
-If you discover any security-related issues, please email [freek@spatie.be](mailto:freek@spatie.be) instead of using the issue tracker.
+If you discover any security-related issues, please email [security@spatie.be](mailto:security@spatie.be) instead of using the issue tracker.
 
 ## Postcardware