Update CONTRIBUTING.md

Author: michield

CONTRIBUTING.md

@@ -9,20 +9,19 @@ Please note that this project is released with a [Contributor Code of Conduct](h
 
 # Reporting an Issue
 
-You can report an issue here in Github or use our issue tracker at https://mantis.phplist.com.
-Most issues are in Mantis, and it may be best to check around to see if your issue has been reported before.
+You can report an issue here in the [Github issue tracker](https://github.com/phpList/phplist3/issues). 
 
 Please follow the guidelines below when creating an issue so that your issue can be more promptly resolved:
 
 * Provide information including the version of PHP and phpList, the type of operating system and Web server, MySQL version, browser type and version;
 * Provide the **complete** error call stack if available. A screenshot to explain the issue is very welcomed.
 * Describe the steps for reproducing the issue. 
-* If possible, try to reproduce this error on our demo at https://demo.phplist.com/lists/admin/
+* If possible, try to reproduce this error on our demo at https://demo.phplist.org/lists/admin/
 
 **Do not report an issue if**
 
 * you are asking how to use some feature. You can ask for help and also discuss your ideas on the [forum](https://discuss.phplist.org/).
-* your issue is about security. Please [contact us directly](mailto:info@phplist.com) to report security issues.
+* your issue is about security. Please [contact us directly](mailto:security@phplist.org) to report security issues.
 
 **Avoid duplicated issues**