check Twitter rate limit status https://developer.twitter.com/en/docs/developer-utilities/rate-limit-status/api-reference/get-application-rate_limit_status rate limit: 900calls / 15min
function checkTwitterRateLimit(need) {
    _twitterAPIIndex = (_twitterAPIIndex + 1) % twitterAPIs.length;
    let twitterAPI = twitterAPIs[_twitterAPIIndex];
    let which = twitterAPIs.length > 1 ? (' ' + (_twitterAPIIndex + 1)) : '';

    return twitterAPI
        .get('application/rate_limit_status', { resources: 'users' })
        .then(result => {
            let now = Date.now() / 1000;
            let stats = result.resources.users['/users/show/:id'];
            let resetSec = Math.ceil(stats.reset - now) + 30;  // +30sec in case server time is different
            console.log(colors.green.bold(`Twitter rate status${which}: need ${need}, remaining ${stats.remaining}, resets in ${resetSec} seconds...`));
            if (need > stats.remaining) {
                let delaySec = clamp(resetSec, 10, 60);
                console.log(colors.blue(`Twitter rate limit exceeded, pausing for ${delaySec} seconds...`));
                return delaySec;
            } else {
                return 0;
            }
        })
        .then(sec => {
            if (sec > 0) {
                return delay(sec * 1000)
                    .then(() => checkTwitterRateLimit(need));
            } else {
                return Promise.resolve();
            }
        })
        .catch(e => {
            console.error(colors.red(`Error: Twitter rate limit: ` + JSON.stringify(e)))
        });
}