Override onMessage w/ ByteString

Author: wtgodbe

src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/OkHttpWebSocketWrapper.java

@@ -17,6 +17,7 @@
 import okhttp3.Response;
 import okhttp3.WebSocket;
 import okhttp3.WebSocketListener;
+import okio.ByteString;
 
 class OkHttpWebSocketWrapper extends WebSocketWrapper {
     private WebSocket websocketClient;
@@ -85,6 +86,11 @@ public void onOpen(WebSocket webSocket, Response response) {
         public void onMessage(WebSocket webSocket, String message) {
             onReceive.invoke(message);
         }
+        
+        @Override
+        public void onMessage(WebSocket webSocket, ByteString bytes) {
+            onReceive.invoke(bytes.utf8());
+        }
 
         @Override
         public void onClosing(WebSocket webSocket, int code, String reason) {