README: Show logos in one row

Author: Anirudh S

README.md

@@ -16,15 +16,9 @@ HelpStack supports the following helpdesk solutions:
 
 
 <div class="row" align="center">
-  <div class="col-sm-4 col-xs-4">
     <img src="http://www.helpstack.io/startup/common-files/img/logos/zendesk.png" alt="Zendesk" width="160">
-  </div>
-  <div class="col-sm-4 col-xs-4" >
     <a href="http://www.happyfox.com" target="_blank"><img src="http://www.helpstack.io/startup/common-files/img/logos/happyfox.png" alt="HappyFox" width="160" style="margin-left:20px; margin-right:20px;"></a>
-  </div>
-  <div class="col-sm-4 col-xs-4">
     <img src="http://www.helpstack.io/startup/common-files/img/logos/desk.png" alt="Desk" width="160">
-  </div>
 </div>