Update README.md

Removed RHEL 8.0 and Yocto, not testing anymore with these

Author: jwillemsen

README.md

@@ -118,12 +118,10 @@ This release of OpenDDS has been tested under the following platforms:
 Linux family:
 * Red Hat EL and CentOS 6.6, 6.8, 6.9 (x86\_64)
 * Red Hat EL and CentOS 7.2, 7.3, 7.4 (x86\_64)
-* Red Hat EL 8.0 (x86\_64)
 * Fedora 24 and 31 (x86\_64)
 * Debian 9.4 (i686)
 * Ubuntu 22.04 LTS (x86\_64)
 * openSUSE 42.1 (x86\_64)
-* Yocto 3.4.4 (ARMv8)
 
 Windows family:
 * Windows 7 (32-bit, 64-bit)