title: Append character to tooltip in noUISlider
body: <p>I'm trying to get <strong>noUISlider</strong> to show the "tooltip" with <code>€</code> as part of it. Here is a working example of what I have:</p>
  
  <p><a href="https://jsfiddle.net/d4nxcwwu/4/" rel="nofollow noreferrer">https://jsfiddle.net/d4nxcwwu/4/</a></p>
  
  <p><strong>Javascript:</strong></p>
  
  <pre><code>$(document).ready( function() { 
  
    var topSlider = document.getElementById('price_slider');
    noUiSlider.create(topSlider, {
        tooltips: [wNumb({ decimals: 0 }), wNumb({ decimals: 0 })],
        behaviour: 'drag-tap',
        connect: true,
        range: {
            'min': 10,
            'max': 500
        },
        // snap: true,
        start: [10, 500]
    });
  
      topSlider.noUiSlider.on('update', function ( values, handle, unencoded, isTap, positions ) {
          $('#price_from').val(parseInt(positions[0]));
          $('#price_to').val(parseInt(positions[1]));
      });
  
  });
  </code></pre>
  
  <p><strong>HTML:</strong></p>
  
  <pre><code>&lt;div style="padding:100px"&gt;
      &lt;div id="price_slider"&gt;&lt;/div&gt;
  &lt;/div&gt;
  
  From: &lt;input type="text" id="price_from" /&gt;&lt;br&gt;
  To:&lt;input type="text" id="price_to" /&gt;
  </code></pre>
  
  <p>The page works, but what I want / need is for the tooltip to show the value like:</p>
  
  <blockquote>
    <p>€1234</p>
  </blockquote>
  
  <p>not just</p>
  
  <blockquote>
    <p>1234</p>
  </blockquote>
  
  <p>The values in the input are fine (I don't want them appended to anything)</p>
  
  <p>I've played around with the <code>format</code> function, but it doesn't seem to do what I want / am expecting.</p>
  
  <pre><code>format: {
      from: function(value) {
             return parseInt(value);
      },
      to: function(value) {
              return parseInt(value);
      }
  },
  </code></pre>
  
  <p>FWIW, I came across this post, but couldn't get it working: <a href="https://stackoverflow.com/questions/39361098/formatting-the-tooltip-in-nouislider">formatting the tooltip in noUISlider</a> </p>
  
  <p>Any suggestions are much appreciated. </p>