doc: fixed e-mail for security reports

Author: vpirogov

SECURITY.md

@@ -19,7 +19,7 @@ We strongly encourage you to report security vulnerabilities to us privately,
 before disclosing them on public forums or opening a public GitHub issue. 
 Report a vulnerability to us in one of two ways:
 * Open a draft [**GitHub Security Advisory**][2]
-* Send e-mail to the following address: **security@lists.uxlfoundation.org**.
+* Send e-mail to the following address: **security@uxlfoundation.org**.
 Along with the report, please include the following info:
   * A descriptive title.
   * Your name and affiliation (if any).