add crate dep graph

Author: rainliu

index.html

@@ -130,7 +130,13 @@
           <input type="checkbox" id="util" name="util" disabled="disabled" checked="checked"> <label for="util">Util</label>
           <a href="https://crates.io/crates/webrtc-util"><img src="https://img.shields.io/crates/v/webrtc-util.svg"></a>
         </div>
-        <img src="./res/webrtc_stack.png">
+        <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>
+            </tr>
+        </table>
         <hr>
         <p>
           <strong>Sponsored with 💖 by</strong><br>