title: Laravel Echo not listening for pusher events
body: <p>Trying to create a kind of chat app with laravel and vuejs.
  Once the message is sent, I fire the event from laravel which reflects on the pusher debug console with the right event class but the listen callback from vuejs is not called at all.</p>
  
  <pre><code>created () {
          window.Echo.channel('chat')
              .listen('MessageSent', (e) =&gt; {
                  console.log(e); //not getting this
                  this.sentMessages.push({
                      message: e.message.message,
                      user: e.user
                  });
              });
  
      },
  </code></pre>
  
  <p>Below is a screenshot of the debug console from pusher
  <a href="https://i.stack.imgur.com/ZJFjV.png" rel="nofollow noreferrer">see the image here as am told I can't embed images yet</a></p>