title: Nothing shows up in the terminal after running node js script (twilio)
body: <p>I am trying to run a simple node js script for making a voice call using Twilio API. The problem is that when I type node app.js, nothing happens and it returns to the console. Like even if there is some kind of error, the error object should be printed into the console, right?</p>
  <pre><code>const accountSid = PROCESS.ENV.SID;
  const authToken = PROCESS.ENV.AUTH;
  const client = require('twilio')(accountSid, authToken);
  
  client.calls
        .create({
           url: 'http://demo.twilio.com/docs/voice.xml',
           to: PROCESS.ENV.TO,
           from: PROCESS.ENV.FROM
         }), function(err, call){
             if(err){
                 console.log(err);
             } else {
                 console.log(call.sid)
             }
         }
  </code></pre>