How to use shebang in RUNME

interpreter.md

use strict;
use warnings;

print "hi RUNME\n";

-- defines a factorial function
function fact (n)
    if n == 0 then
    return 1
    else
    return n * fact(n-1)
    end
end

print("enter a number:")
a = io.read("*number")        -- read a number
print(fact(a))