update index.htm

Author: rainliu

index.html

@@ -133,8 +133,8 @@
         <table cellspacing="0" cellpadding="0" border="0" align="center">
             <tr>
               <td style="border: 0"><img src="./res/webrtc_crates_dep_graph.png"></td>
-              <td style="border: 0">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
-              <td style="border: 0"><img src="./res/webrtc_stack.png"></td>
+              <td style="border: 0">&nbsp;</td>
+              <td style="border: 0"><br><img src="./res/webrtc_stack.png"></td>
             </tr>
         </table>
         <hr>