title: Node's title doesn't bold the text in tooltip
body: <p>I use NetworkX and PyVis to generate network graph and view the generated html file in a browser. I had nodes' title constructed using html tags, example <code>&lt;b&gt;this_is_the_node_title_name&lt;/b&gt;</code>, so that on hovering over the node, the title is shown in bold (as tooltip), and that did appear as <strong>this_is_the_node_title_name</strong> as expected, and that was on PyVis version 0.9.1.
  And I am now on PyVis version 0.2.1 and the same doesn't happen anymore., and on hovering over a node i see the tooltip rendering like <code>&lt;b&gt;this_is_the_node_title_name&lt;/b&gt;</code> instead of <strong>this_is_the_node_title_name</strong>.</p>
  <p>I understand the version of PyVis is different, but i am unable to figure out how to make the node's title to appear as <strong>this_is_the_node_title_name</strong> instead of <code>&lt;b&gt;this_is_the_node_title_name&lt;/b&gt;</code></p>
  <p>Please help, i couldn't figure out what is causing to not working here in the code.</p>
  <p>Here is a sample graph html reproducing my problem:</p>
  <pre class="lang-html prettyprint-override"><code>&lt;html&gt;
  &lt;head&gt;
  &lt;link rel=&quot;stylesheet&quot; href=&quot;https://cdn.jsdelivr.net/npm/vis-network@latest/styles/vis-network.css&quot; type=&quot;text/css&quot; /&gt;
  &lt;script type=&quot;text/javascript&quot; src=&quot;https://cdn.jsdelivr.net/npm/vis-network@latest/dist/vis-network.min.js&quot;&gt; &lt;/script&gt;
  &lt;center&gt;
  &lt;h1&gt;&lt;/h1&gt;
  &lt;/center&gt;
  
  &lt;!-- &lt;link rel=&quot;stylesheet&quot; href=&quot;../node_modules/vis/dist/vis.min.css&quot; type=&quot;text/css&quot; /&gt;
  &lt;script type=&quot;text/javascript&quot; src=&quot;../node_modules/vis/dist/vis.js&quot;&gt; &lt;/script&gt;--&gt;
  
  &lt;style type=&quot;text/css&quot;&gt;
  
          #mynetwork {
              width: 500px;
              height: 500px;
              background-color: #ffffff;
              border: 1px solid lightgray;
              position: relative;
              float: left;
          }
  
          
  
          
  
          
  &lt;/style&gt;
  
  &lt;/head&gt;
  
  &lt;body&gt;
  &lt;div id = &quot;mynetwork&quot;&gt;&lt;/div&gt;
  
  
  &lt;script type=&quot;text/javascript&quot;&gt;
  
      // initialize global variables.
      var edges;
      var nodes;
      var network; 
      var container;
      var options, data;
  
      
      // This method is responsible for drawing the graph, returns the drawn network
      function drawGraph() {
          var container = document.getElementById('mynetwork');
          
          
  
          // parsing and collecting nodes and edges from the python
          nodes = new vis.DataSet(
              [
                  {
                      &quot;color&quot;: &quot;#00ff1e&quot;,
                      &quot;id&quot;: 1,
                      &quot;title&quot;: &quot;&lt;b&gt;NODE 1&lt;/b&gt;&quot;,
                      &quot;physics&quot;: false,
                      &quot;shape&quot;: &quot;dot&quot;,
                      &quot;label&quot;: &quot;I am node 1&quot;,
                      &quot;value&quot;: 1,
                  }
                  ,
                  {
                      &quot;color&quot;: &quot;#162347&quot;,
                      &quot;id&quot;: 2,
                      &quot;title&quot;: &quot;&lt;i&gt;NODE 2&lt;/i&gt;&quot;,
                      &quot;physics&quot;: false,
                      &quot;shape&quot;: &quot;dot&quot;,
                      &quot;label&quot;: &quot;node 2 here&quot;,
                      &quot;value&quot;: 1,
                  },
                  {
                      &quot;color&quot;: &quot;#dd4b39&quot;,
                      &quot;id&quot;: 3,
                      &quot;title&quot;: &quot;&lt;b&gt;&lt;i&gt;NODE 3&lt;/i&gt;&lt;/b&gt;&quot;,
                      &quot;physics&quot;: false,
                      &quot;shape&quot;: &quot;dot&quot;,
                      &quot;label&quot;: &quot;and im node 3&quot;,
                      &quot;value&quot;: 1,
                  }
                  ]
          );
          edges = new vis.DataSet([{&quot;from&quot;: 1, &quot;to&quot;: 2}, {&quot;from&quot;: 1, &quot;to&quot;: 3}]);
  
          // adding nodes and edges to the graph
          data = {nodes: nodes, edges: edges};
  
          var options = {
      &quot;configure&quot;: {
          &quot;enabled&quot;: false
      },
      &quot;edges&quot;: {
          &quot;color&quot;: {
              &quot;inherit&quot;: true
          },
          &quot;smooth&quot;: {
              &quot;enabled&quot;: true,
              &quot;type&quot;: &quot;dynamic&quot;
          }
      },
      &quot;interaction&quot;: {
          &quot;dragNodes&quot;: true,
          &quot;hideEdgesOnDrag&quot;: false,
          &quot;hideNodesOnDrag&quot;: false
      },
      &quot;physics&quot;: {
          &quot;enabled&quot;: true,
          &quot;stabilization&quot;: {
              &quot;enabled&quot;: true,
              &quot;fit&quot;: true,
              &quot;iterations&quot;: 1000,
              &quot;onlyDynamicEdges&quot;: false,
              &quot;updateInterval&quot;: 50
          }
      }
  };
          
          
  
          
  
          network = new vis.Network(container, data, options);
       
          
  
  
          
  
          return network;
  
      }
  
      drawGraph();
  
  &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  <p>In that html file, the bold/italic tags are not rendered on overing over a node. For me, it looks like this image:
  <a href="https://i.stack.imgur.com/ABDbu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ABDbu.png" alt="enter image description here" /></a></p>