isEmail accepts incorrect domain.

[itbali]

When doing check with isEmail('test@gma--il.com') we receive true, but expected false..

looks like this fixes will be enough:

const default_fqdn_options = {
    require_tld: true,
    allow_underscores: false,
    allow_trailing_dot: false,
    allow_numeric_tld: false,
    allow_wildcard: false,
    ignore_max_length: false,
    disallow_consecutive_hyphens: true,
};

function isFQDN(str, options) {
    assertString(str);
    options = merge(options, default_fqdn_options);

    // ... (other code remains unchanged)

    /* Check for consecutive hyphens in the domain part */
    if (options.disallow_consecutive_hyphens && /--/.test(str)) {
        return false;
    }

    // ... (rest of the code remains unchanged)
}

[kshavp]

@itbali, I have submitted a PR regarding this issue.