title: How to change color of annotation text in google-charts
body: <p>How do you change the color of an annotation text in Google Chart Tools LineChart ?</p>
  
  <p>Here is an example</p>
  
  <pre><code>google.load('visualization', '1', {packages: ['corechart']});
  google.setOnLoadCallback(drawChart);
  
  function drawChart() {
      var data = new google.visualization.DataTable();      
      data.addColumn('date', 'Date');
      data.addColumn('number', 'Sales');
      data.addColumn({id: 'title', label: 'Title', type: 'string', role: 'annotation'});
      data.addRows([
          [new Date(2012, 3, 5), 80, null],
          [new Date(2012, 3, 12), 120, 'New Product'],
          [new Date(2012, 3, 19), 80, null],
          [new Date(2012, 3, 26), 65, null],
          [new Date(2012, 4, 2), 70, null],
      ]);
  
      var options = {
          title: 'Sales by Week',
          displayAnnotations: true,
          hAxis: {title: 'Date', 
                  titleTextStyle: {color: 'grey'}},
          colors: ['#f07f09']
        };
  
      var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
      chart.draw(data, options);      
  }
  </code></pre>
  
  <p>I want the line to be orange and the annotation text in grey. Currently the annotation text is orange. </p>