title: JIMP image composite not rendered
body: <p>I'm using Jimp with nodejs to create a dynamic image of a date,
  This is my function:</p>
  <pre><code>const buildDate = function(date) {
      return new Promise(function(resolve, reject) {
          Jimp.create(55, 500).then(dateCanvas =&gt; {
              for (let i = 0; i &lt; date.length; i++) {
                  let c = date.charAt(i);
                  let rand = Math.floor(Math.random() * 3);
                  console.log(`${c}${rand}.png`);
                  Jimp.read(path.join(numbers, (isNumber(c)?`${c}${rand}.png`:`s${rand}.png`)), (err, numberImage) =&gt; {
                      if (err) return reject(err);
                      dateCanvas.composite(numberImage, i*25, 0, [], () =&gt; {
                          
                          if (i &gt;= (date.length-1)) return resolve(dateCanvas);
                      });
                  });
              }
          });
      });
  };
  </code></pre>
  <p>I'm using my function like this:</p>
  <pre><code>buildDate('25/12/2009')
           .then(dateCanvas =&gt; {
                 image.blit(dateCanvas, 139, 1224)
           }).catch(err =&gt; reject(err));
  </code></pre>
  <p>I have in my &quot;numbers folders&quot;, 3 png for each number from 0 to 9 of 30*55.</p>
  <p>My problem is: only 2 numbers showing on the result. I think its because i don't wait for the other images to be read but I don't know how to do?
  Thanks a lot in advance an sorry for my bad english.</p>