[ANN] lglicua-0.1-alpha6: Documentation tweak.

[sur-behoffski <sur_behoffski@...>]

G'day,

None of the major functionality of the -alpha5 release has changed;
I've merely changed README.md (and the installer's "terse help") to be
slightly clearer about:

    1. Including Lua 5.1, 5.2, 5.3 and (New!) 5.4 across all
       supported distributions;

    2. Various Red Hat/CentOS-7/8 family changes; and

    3. Mention newly-supported GNU/Linux distributions:
        - MX GNU/Linux (MX21ahs) (Debian/Ubuntu family); and
        - Rocky Linux (8.5) -- sort-of replaces CentOS 8.

cheers,

sur-behoffski (Brenton Hoff)
programmer, Grouse Software