battle of multiple arguments

[davmonk]

in ts:

100 } else if (!arg.startsWith("-")) {
101 address = arg;
102 }

•	Multiple positional args are accepted
•	Last one silently wins

fix with:

let addressSet = false;
...
if (!arg.startsWith("-")) {
  if (addressSet) {
    throw new Error("Only one address may be specified");
  }
  address = arg;
  addressSet = true;
}