code: function updateExchangeCount (fileName) {
  
      log.bright.cyan ('Updating exchange count →', fileName.yellow)
  
      let oldContent = fs.readFileSync (fileName, 'utf8')
      let newContent =
          oldContent.replace (/shields\.io\/badge\/exchanges\-[0-9a-z]+\-blue/g, 'shields.io/badge/exchanges-' + ccxt.exchanges.length + '-blue')
  
  
      fs.truncateSync (fileName)
      fs.writeFileSync (fileName, newContent)
  
  }
docs: -----------------------------------------------------------------------------