Update index.html

Author: Igor Khomenko

samples/webrtc/index.html

@@ -5,6 +5,8 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
 
     <title>QuickBlox JavaScript WebRTC sample</title>
+    
+    <link rel="canonical" href="https://quickblox.github.io/quickblox-javascript-sdk/samples/webrtc" />
 
     <link rel="shortcut icon" href="https://quickblox.com/favicon.ico">