title: Adding filename and line number to Monolog output
body: <p>Couldn't find a way to add a the file name and the line number from which the log function was called.
  I'm using a simple StreamHandler:</p>
  
  <pre><code>$this-&gt;log = new Logger('APP');
  $this-&gt;log-&gt;pushHandler(new StreamHandler('/logs/app.log', Logger::DEBUG));
  </code></pre>
  
  <p>and I would like an output of something like that:</p>
  
  <pre><code>[2017-12-27 12:38:58 filename.php:1234] APP.DEBUG: test 
  </code></pre>
  
  <p>or any other format which includes the file name and line number.</p>
  
  <p>Thanks and best regards</p>