Asterisk versions 16.20.0 and 18.6.0 published for Distro

[lgaetz (Lorne Gaetz)]

Available now from sng-pkgs repo:

# yum list asterisk18 asterisk16
Loaded plugins: fastestmirror, versionlock
Loading mirror speeds from cached hostfile
Installed Packages
asterisk16.x86_64                    16.20.0-1.sng7                    @sng-pkgs
Available Packages
asterisk18.x86_64                    18.6.0-1.sng7                     sng-pkgs