README: Update with details of security issues reporting

rbradford · rbradford · commit 62fe83272592 · 2021-04-08T15:30:45.000+01:00
Signed-off-by: Rob Bradford &lt;robert.bradford@intel.com&gt;
diff --git a/README.md b/README.md
@@ -97,3 +97,8 @@ And clear-28660-kvm.img:
 https://download.clearlinux.org/releases/28660/clear/clear-28660-kvm.img.xz
 
 sha1sum: 5fc086643dea4b20c59a795a262e0d2400fab15f
+
+## Security issues
+
+Please use the GitHub security advisories feature for reporting issues:
+https://github.com/cloud-hypervisor/rust-hypervisor-firmware/security/advisories/new
