Fixing the Price Feed by Replacing the Coinmarketcap API

As you might know, the coinmarketcap doesn't provide the free APIs anymore.. and recently I found out the pricefeed throws exception due to this:

40|feed    | Sun Jun 21 2020 09:58:22 GMT+0000 (Coordinated Universal Time) - Error loading STEEM price from Bittrex: TypeError: Cannot read property 'price_usd' of undefined
40|feed    | Sun Jun 21 2020 09:58:32 GMT+0000 (Coordinated Universal Time) - Error loading STEEM price from Bittrex: TypeError: Cannot read property 'price_usd' of undefined
40|feed    | Sun Jun 21 2020 09:58:41 GMT+0000 (Coordinated Universal Time) - Broadcasting feed_publish transaction: {"base":"0.209 SBD","quote":"1.000 STEEM"}

I took a look, and found out it is because of the following code:
https://github.com/MattyIce/pricefeed/blob/master/feed.js#L89

function loadPriceBittrex(callback, retries) {
  // Load STEEM price in BTC from bittrex and convert that to USD using BTC price in coinmarketcap
  request.get('https://api.coinmarketcap.com/v1/ticker/bitcoin/', function (e, r, data) {
    request.get('https://bittrex.com/api/v1.1/public/getticker?market=BTC-STEEM', function (e, r, btc_data) {
      try {
        steem_price = parseFloat(JSON.parse(data)[0].price_usd) * parseFloat(JSON.parse(btc_data).result.Last);
        log('Loaded STEEM Price from Bittrex: ' + steem_price);

        if (callback)
          callback(steem_price);
      } catch (err) {
        log('Error loading STEEM price from Bittrex: ' + err);

        if(retries < 2)
          setTimeout(function () { loadPriceBittrex(callback, retries + 1); }, 10 * 1000);
      }
    });
  });
}

One easy fix is to use a different API end point to get the BTC ticker, like this: https://bittrex.com/api/v1.1/public/getticker?market=USDT-BTC

And thus, I am creating a PR: https://github.com/MattyIce/pricefeed/pull/5/files

The STEEM price is calculated based on two prices: BTC-USDT and BTC-STEEM (Simple Math isn't it?)

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Every little helps! I hope this helps!

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