Update README

Author: PaulMcMillan

README.md

@@ -20,4 +20,4 @@ Below are notifications for security vulnerabilities in third-party software.
 | August 13, 2019 | Important | [HTTP/2 Denial of Service Advisory](advisories/third-party/2019-002.md) |
 | June 17, 2019 | Important | [Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities](advisories/third-party/2019-001.md) | 
 
-Unfortunately we are not able to address software support requests related to advisories in this repository.
+Unfortunately we are not able to address software support issues related to advisories in this repository. Please use normal upstream support channels.