maxRedirects option cannot be set to 0

[jbenezech]

Because of falsy value checks, when maxRedirects is set to zero, it defaults to DEFAULT_MAX_REDIRECTS.

A workaround to disallow redirects is to instantiate the parser with maxRedirects to 1 and pass this value in the parseURL function

const parser = new Parser<Record<string, unknown>>({maxRedirects: 1});
const feed = await parser.parseURL(url, undefined, 1);

[rbren]

Good catch! Happy to accept a PR here