title: Font size for footer, in jsPDF autoTable
body: <p>So,</p>
  
  <p>I've successfully modified everything else but can't figure how to change just the footers font size, it is now way too big compared to table font itself.</p>
  
  <pre><code>    let pdf = new jsPDF({orientation: 'l'});
      let res = pdf.autoTableHtmlToJson(document.getElementById('capture'));
      const totalPagesExp = '{total_pages_count_string}';
      let height = pdf.internal.pageSize.getHeight();
  
      const footer = function(res) {
          let str = 'Sivu ' + res.pageCount;
  
          if (typeof pdf.putTotalPages === 'function') {
              str = str + ' / ' + totalPagesExp;
              str = str + ' -- ' + moment().format('L').toString();
          }
  
          //PROBLEM GOES HERE
          pdf.text(str, 5, height - 5, {
              fontSize: 5
          });
      };
  
      pdf.autoTable(
          res.columns,
          res.data,
          {margin: {top: 25, bottom: 15},
          styles: {overflow: 'linebreak',
                  fontSize: 6},
          showHeader: 'everyPage',
          afterPageContent: footer,
          theme: 'plain'});
  
      if (typeof pdf.putTotalPages === 'function') {
          pdf.putTotalPages(totalPagesExp);
      }
  
      pdf.save( 'file.pdf');
  </code></pre>
  
  <p>Footer itself is iterating nicely, page numbers show up as they are suppose to, but even if i pass options object into <code>psd.text()</code> as stated in documentation, it still wont change the font size.</p>
  
  <p><a href="https://rawgit.com/MrRio/jsPDF/master/docs/jsPDF.html#text" rel="nofollow noreferrer">Documentation for text</a></p>