update index.html

Author: Rain Liu

index.html

@@ -88,6 +88,9 @@
             A pure Rust implementation of WebRTC stack. Rewrite <a href="http://Pion.ly">Pion</a> WebRTC stack in Rust
           </p>
           <hr>
+          <input type="checkbox" id="peer" name="peer" disabled="disabled"> <label for="peer">Peer</label>
+          <a href="https://crates.io/crates/webrtc-peer"><img src="https://img.shields.io/crates/v/webrtc-peer.svg"></a>
+          <br>
           <input type="checkbox" id="media" name="media" disabled="disabled"> <label for="media">Media</label>
           <a href="https://crates.io/crates/webrtc-media"><img src="https://img.shields.io/crates/v/webrtc-media.svg"></a>
           &nbsp;