title: Angular 5 ngx-toastr not displaying html message
body: <p>I'm using Angular 5 with <strong>ngx-toastr</strong>. I have used the following code which renders HTML tag along with the message like: <code>Hi&lt;b&gt;Hello&lt;/b&gt;</code> which is not expected.</p>
  
  <pre><code>this.toastr.warning("Hi&lt;b&gt;Hello&lt;/b&gt;");
  </code></pre>
  
  <p>Also, I used the below code which has no console error neither any output (popup):</p>
  
  <pre><code>this.toastr.show("&lt;font color=\"red\"&gt;Hi&lt;b&gt;Hello&lt;/b&gt;&lt;/red&gt;&lt;/font&gt;",null,{
  disableTimeOut: true,
  tapToDismiss: false,
  closeButton: true,
  positionClass:'bottom-left',
  enableHtml:true
  });
  </code></pre>
  
  <p>How can I enable HTML in ngx-toastr so that message can looks like:
  hi<strong>Hello</strong></p>