Add reference to yorc in orchestrators page

Author: stefbenoist

documentation/2.1.0/orchestrators/orchestrators.html

@@ -28,7 +28,9 @@ <h1 class="pull-left" style="margin-top: 0px;">Orchestrators</h1>
         </div>
         <p>This section details configuration of supported orchestrators in alien 4 cloud.</p>
 
-<p>We currently officially support <strong>Cloudify 3</strong>, as well as <strong>Cloudify 4</strong>. and are working with Cloudsoft on the support of Apache Brooklyn.</p>
+<p>From the 2.1.0 version, we  currently officially support the <strong>Yorc</strong> orchestrator.</p>
+
+<p>In 2.0.0, we previously supported <strong>Cloudify 3</strong>, as well as <strong>Cloudify 4</strong>. and are working with Cloudsoft on the support of Apache Brooklyn.</p>
 
 <p>In 1.4.0, we added experimental support of <strong>Marathon</strong>, a meta-framework for <strong>Mesos</strong> which enables scheduling and orchestration of <strong>Docker containers</strong>.</p>